posts: 29862
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| 29862 | Want to reduce your carbon footprint? Less meat is nearly always better than sustainable meat | untitled-reusable-block-194 | wp_block | publish | <!-- wp:paragraph --> <p>What is the best way to reduce the carbon footprint of our diet?</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>I have <a href="https://ourworldindata.org/food-choice-vs-eating-local">shown previously</a> that <em>what</em> we choose to eat has the largest impact, making a bigger difference than how far our food has traveled, or how much packaging it’s wrapped in. This is because only a small fraction comes from transport and packaging and most of our food emissions come from processes on the farm, or from <a href="https://ourworldindata.org/land-use">land use</a> change.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Regardless of whether you compare the footprint of foods in terms of their <a href="https://ourworldindata.org/food-choice-vs-eating-local">weight</a> (e.g. one kilogram of cheese versus one kilogram of peas); <a href="https://ourworldindata.org/grapher/ghg-per-protein-poore">protein content</a> ; or <a href="https://ourworldindata.org/grapher/ghg-kcal-poore">calories</a>, the overall conclusion is the same: plant-based foods tend to have a lower carbon footprint than meat and dairy. In many cases a much smaller footprint.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>As an example: producing 100 grams of protein from peas <a href="https://ourworldindata.org/grapher/ghg-per-protein-poore">emits just</a> 0.4 kilograms of carbon dioxide equivalents (CO<sub>2</sub>eq). To get the same amount of protein from beef, emissions would be nearly 90 times higher, at 35 kgCO<sub>2</sub>eq.{ref}The mean emissions from beef very much depend on whether it’s sourced from dairy herds or from dedicated beef herds. Beef from dairy herds tends to have a lower footprint since its footprint is essentially ‘shared’ with dairy co-products. The mean footprint of beef from dairy herds is 17 kgCO<sub>2</sub>eq; from dedicated beef herds it’s 50 kgCO<sub>2</sub>eq. Around 56% of global beef production comes from dedicated beef herds; and 44% from dairy herds. The mean footprint is approximately 35 kgCO<sub>2</sub>eq [56% * 50 + 44% *17 = 35 kgCO<sub>2</sub>eq]. Note that if you use the <em>median</em> footprint, this figure is 25 kgCO<sub>2</sub>eq – more than 60 times higher than peas.{/ref}</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>But it comes with the caveat that comparisons are made based on global averages.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Many argue that this overlooks the large variation in the footprints of foods across the world. Using global averages might give us a misleading picture for some parts of the world or some producers. If I source my beef or lamb from low-impact producers, could they have a lower footprint than plant-based alternatives?<br><br>The evidence suggests, no: plant-based foods emit fewer greenhouse gases than meat and dairy, regardless of how they are produced.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Let’s take a look at the full range of footprints for protein-rich foods. </p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Protein-rich foods account for the bulk of our dietary emissions. In European diets, meat, dairy and eggs account for 83%.{ref}Sandström, V., Valin, H., Krisztin, T., Havlík, P., Herrero, M., & Kastner, T. (2018). The role of trade in the greenhouse gas footprints of EU diets. <em>Global Food Security</em>, <em>19</em>, 48-55.{/ref} That’s why I focus on them here.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>In the visualization we see the range of carbon footprints for these foods. This data is from the largest meta-analysis of global food systems to date, published in <em>Science</em> by Joseph Poore and Thomas Nemecek (2018).{ref}Poore, J., & Nemecek, T. (2018). <a href="https://science.sciencemag.org/content/360/6392/987">Reducing food’s environmental impacts through producers and consumers</a>. <em>Science</em>, 360(6392), 987-992.{/ref} In this study, the authors looked at data across more than 38,000 commercial farms in 119 countries.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>All greenhouse gas (GHG) emissions are measured in kilograms of carbon dioxide equivalents per 100 grams of protein; this metric takes account of not only carbon dioxide but also the range of other greenhouse gases – this is further explained in the footnote.{ref}CO<sub>2</sub> is the most important GHG, but not the only one – agriculture is a large source of the greenhouse gases methane and nitrous oxide. To capture all GHG emissions from food production researchers therefore express them in kilograms of ‘carbon dioxide equivalents’. </p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>To express all greenhouse gases in carbon dioxide equivalents (CO2-eq), they are each weighted by their <a href="https://ourworldindata.org/co2-and-other-greenhouse-gas-emissions#global-warming-potential-of-greenhouse-gases">global warming potential</a> (GWP) value. GWP measures the relative warming impact one molecule or unit mass of a greenhouse gas relative to carbon dioxide over a given timescale – usually over 100 years. GWP100 values are used to combine greenhouse gases into a single metric of emissions called carbon dioxide equivalents (CO2eq). CO2eq is then derived by multiplying the mass of emissions of a specific greenhouse gas by its equivalent GWP100 factor. The sum of all gases in their CO2eq form provide a measure of total greenhouse gas emissions.{/ref} To make reading less repetitive, I refer to it as ‘kgCO<sub>2</sub>eq’ below. </p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>The visualization shows the median footprint – highlighted by a small white circle for each food product. </p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>But since there are large differences between producers, this chart also shows the full spectrum of emissions – from the lowest to highest producers. The height at each point in the curve represents the amount of global production with that specific footprint.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>The median footprint for beef is 25 kgCO<sub>2</sub>eq.{ref}This 25 kgCO<sub>2</sub>eq figure represents the <em>median</em> emissions from beef production. You might notice that this is lower than our earlier figure of 35 kgCO<sub>2</sub>eq – this represents the <em>mean</em> emissions from beef. Because of the skew in production – a small number of producers create most impact – the mean and median values can be quite different.{/ref} But some producers have a much higher footprint: ten percent emit more than 105 kgCO<sub>2</sub>eq per 100 grams. At the other end, some are much lower. Ten percent emit less than 9 kgCO<sub>2</sub>eq. We see from the height of the curve that most beef production lies in the range between 17 to 27 kgCO<sub>2</sub>eq.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>How do the distributions between plant-based and meat-based sources compare?</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Plant-based protein sources – tofu, beans, peas and nuts – have the lowest carbon footprint. This is certainly true when you compare average emissions. But it’s still true when you compare the extremes: there’s not much overlap in emissions between the <em>worst</em> producers of plant proteins, and the <em>best</em> producers of meat and dairy.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Let’s compare the highest-impact producers (the top ten percent) of plant-based proteins with the lowest-impact producers (the bottom ten percent) of meat and dairy.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>The pea producers with the highest footprint emit just 0.8 kgCO<sub>2</sub>eq per 100 grams of protein.{ref}Here, by ‘largest impact’ I have taken the 90th percentile value. This means that 90% of global pea, tofu or nut production has a carbon footprint less than this figure.{/ref} For nuts it is 2.4 and for tofu, 3.5 kgCO<sub>2</sub>eq. All are several times less than the lowest impact lamb (12 kgCO<sub>2</sub>eq) and beef (9 kgCO<sub>2</sub>eq). Emissions are also lower than those from the best cheese and pork (4.5 kgCO<sub>2</sub>eq); and slightly lower or comparable to those from the lowest-footprint chicken (2.4 kgCO<sub>2</sub>eq).{ref}Here, by ‘lowest impact’ I have taken the 10th percentile value. This means that only 10% of global production has a carbon footprint below this figure.{/ref}</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>If you want a lower-carbon diet, eating <em>less </em>meat is nearly always better than eating the <em>most sustainable</em> meat.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>This is also true for the differences <em>between</em> meat products. Chicken, eggs, and pork nearly always have a lower footprint than beef and lamb: there is some, but not much overlap between the <em>worst</em> poultry and pork producers, and the <em>best</em> beef and lamb producers. The world’s highest impact chicken and pork have a footprint of 12 and 14 kgCO<sub>2</sub>eq. This is similar to, or only slightly higher than, the world’s best beef and lamb.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Regardless of where you get your beef or lamb from, substituting with chicken and pork is likely to reduce your carbon footprint.</p> <!-- /wp:paragraph --> <!-- wp:image {"id":29926,"sizeSlug":"full"} --> <figure class="wp-block-image size-full"><img src="https://owid.cloud/app/uploads/2020/02/Carbon-footprint-of-protein-foods-2.png" alt="" class="wp-image-29926"/></figure> <!-- /wp:image --> <!-- wp:heading {"level":4} --> <h4>More sustainable meat production can still make a big difference</h4> <!-- /wp:heading --> <!-- wp:paragraph --> <p>Eating less meat, or switching to lower impact meats such as chicken, eggs or pork is the most effective way for individuals to reduce their dietary footprint.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>But if you want to eat meat, then the choice of meat also matters. Consumers can have an impact, but so can food producers.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>The world is not going to abandon livestock farming completely – at least not any time soon. And there are a number of reasons we wouldn’t want it to: it is not only an important <a href="https://ourworldindata.org/grapher/share-of-the-labor-force-employed-in-agriculture">source of income</a> for many, but can also be a key source of nutrition in local settings. Particularly in lower-income countries where <a href="https://ourworldindata.org/grapher/dietary-compositions-by-commodity-group?country=BGD">diets lack diversity</a>, small amounts of meat and dairy can be an essential source of protein and <a href="https://ourworldindata.org/micronutrient-deficiency">micronutrients</a>.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Globally, greenhouse gas emissions are massively skewed towards high-impact producers. This can be seen at the bottom of our visualization. The red curve shows the sum of all protein products. </p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Most of the protein we produce is relatively low-impact: 75% of production has a footprint between -3 and 11 kgCO<sub>2</sub>eq per 100 grams of protein. This creates just 30% of protein’s emissions.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>High-impact production – with a footprint greater than 11 kgCO<sub>2</sub>eq – produces just 25% of our protein, but 70% of its emissions. To put this ‘high-impact production’ in context: the top quarter of protein production emits more than five billion tonnes of CO<sub>2</sub>eq each year. This is more than the EU’s <em>total</em> annual <a href="https://ourworldindata.org/co2-and-other-greenhouse-gas-emissions">greenhouse gas emissions</a> from all sectors.{ref}The European Environment Agency <a href="https://www.eea.europa.eu/data-and-maps/data/data-viewers/greenhouse-gases-viewer">reports that</a> the EU’s total greenhouse gas emissions in 2017 were approximately 4.5 billion tonnes of carbon dioxide equivalents.{/ref}</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Much of this skew, as we’ve already discussed, comes from the differences between plant-based sources and meats such as beef and lamb. But a lot comes from the large variations in footprint for specific products.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>There is much more variation in the footprints of beef, lamb, dairy, and <a href="https://ourworldindata.org/seafood-production#how-is-our-seafood-produced">aquaculture</a> production than for other foods. This is because there are large differences in the intensity and practices used in ruminant livestock, and fish farming across the world. This is different from poultry and pig farming: 61% of pork, 81% of chicken and 86% of eggs are produced intensively in industrial-farm settings.{ref}MacLeod, M., Gerber, P., Mottet, A., Tempio, G., Falcucci, A., Opio, C., Vellinga, T., Henderson, B. & Steinfeld, H. (2013). <a href="http://www.fao.org/3/i3460e/i3460e.pdf">Greenhouse gas emissions from pig and chicken supply chains – A global life cycle assessment</a>. <em>Food and Agriculture Organization of the United Nations (FAO)</em>, Rome.{/ref} These systems are very similar wherever they are in the world.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>One factor which explains a lot of the variation for beef is whether it’s sourced from a dairy herd (where the cattle also produce milk) or a herd dedicated to beef production. Just under half (44%) of the world’s beef comes from the dairy sector. And it produces 60% lower emissions because its footprint is shared with dairy co-products.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Geography also plays a role in the large variations we see for beef, lamb and aquaculture: farming approaches are often adopted in line with local conditions such as soil fertility, terrain and temperature.{ref}German, R. N., Thompson, C. E., & Benton, T. G. (2017). <a href="https://onlinelibrary.wiley.com/doi/full/10.1111/brv.12251">Relationships among multiple aspects of agriculture's environmental impact and productivity: a meta‐analysis to guide sustainable agriculture</a>. <em>Biological Reviews</em>, <em>92</em>(2), 716-738.{/ref} Opportunities for food producers to reduce emissions are therefore very specific to local conditions.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>But there are some general recommendations that are clear from the research: improving degraded pasture; improving lifetime animal productivity; increasing oxygen flow in aquaculture ponds, particularly in warm climates; and avoiding the conversion of <a href="https://ourworldindata.org/forests">forests</a> and peatlands for agriculture will all make a difference.{ref}Gerber, H. Steinfeld, B. Henderson, A. Mottet, C. Opio, J. Dijkman, A. Falcucci, G. Tempio, “<a href="http://www.fao.org/3/a-i3437e.pdf">Tackling climate change through livestock: A global assessment of emissions and mitigation opportunities</a>” (FAO, 2013).{/ref} Land use change can play a large role in the final emissions; this means beef from South America often has a high footprint due to deforestation. Good pasture quality is also important: climate has a strong impact on this, but effective management practices can also make a difference; New Zealand, France and the UK are some examples where footprints are often lower.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>If we want to reduce the emissions from our food, there is massive scope for both consumers and producers. For producers, understanding and adopting best farm and land management practices can mitigate the highest impacts of production.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>As consumers, the biggest difference we can make is to eat more plant-based sources of protein such as tofu, nuts, peas, and beans. This is the case regardless of where you are in the world.</p> <!-- /wp:paragraph --> | {
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"text": "eq.{ref}The mean emissions from beef very much depend on whether it\u2019s sourced from dairy herds or from dedicated beef herds. Beef from dairy herds tends to have a lower footprint since its footprint is essentially \u2018shared\u2019 with dairy co-products. The mean footprint of beef from dairy herds is 17 kgCO",
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"text": "eq. Around 56% of global beef production comes from dedicated beef herds; and 44% from dairy herds. The mean footprint is approximately 35 kgCO",
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"text": "Many argue that this overlooks the large variation in the footprints of foods across the world. Using global averages might give us a misleading picture for some parts of the world or some producers. If I source my beef or lamb from low-impact producers, could they have a lower footprint than plant-based alternatives?",
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"text": "Protein-rich foods account for the bulk of our dietary emissions. In European diets, meat, dairy and eggs account for 83%.{ref}Sandstr\u00f6m, V., Valin, H., Krisztin, T., Havl\u00edk, P., Herrero, M., & Kastner, T. (2018). The role of trade in the greenhouse gas footprints of EU diets.\u00a0",
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"text": "All greenhouse gas (GHG) emissions are measured in kilograms of carbon dioxide equivalents per 100 grams of protein; this metric takes account of not only carbon dioxide but also the range of other greenhouse gases \u2013 this is further explained in the footnote.{ref}CO",
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"text": " is the most important GHG, but not the only one \u2013 agriculture is a large source of the greenhouse gases methane and nitrous oxide. To capture all GHG emissions from food production researchers therefore express them in kilograms of \u2018carbon dioxide equivalents\u2019. ",
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"text": " (GWP) value. GWP measures the relative warming impact one molecule or unit mass of a greenhouse gas relative to carbon dioxide over a given timescale \u2013 usually over 100 years. GWP100 values are used to combine greenhouse gases into a single metric of emissions called carbon dioxide equivalents (CO2eq). CO2eq is then derived by multiplying the mass of emissions of a specific greenhouse gas by its equivalent GWP100 factor. The sum of all gases in their CO2eq form provide a measure of total greenhouse gas emissions.{/ref} To make reading less repetitive, I refer to it as \u2018kgCO",
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"text": "The visualization shows the median footprint \u2013 highlighted by a small white circle for each food product.\u00a0",
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"text": "But since there are large differences between producers, this chart also shows the full spectrum of emissions \u2013 from the lowest to highest producers. The height at each point in the curve represents the amount of global production with that specific footprint.",
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"text": " emissions from beef production. You might notice that this is lower than our earlier figure of 35 kgCO",
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"text": " emissions from beef. Because of the skew in production \u2013 a small number of producers create most impact \u2013 the mean and median values can be quite different.{/ref} But some producers have a much higher footprint: ten percent emit more than 105 kgCO",
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"text": "eq per 100 grams. At the other end, some are much lower. Ten percent emit less than 9 kgCO",
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"text": "eq. We see from the height of the curve that most beef production lies in the range between 17 to 27 kgCO",
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"text": "Plant-based protein sources \u2013 tofu, beans, peas and nuts \u2013 have the lowest carbon footprint. This is certainly true when you compare average emissions. But it\u2019s still true when you compare the extremes: there\u2019s not much overlap in emissions between the ",
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"text": "The pea producers with the highest footprint emit just 0.8 kgCO",
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"text": "eq per 100 grams of protein.{ref}Here, by \u2018largest impact\u2019 I have taken the 90th percentile value. This means that 90% of global pea, tofu or nut production has a carbon footprint less than this figure.{/ref} For nuts it is 2.4 and for tofu, 3.5 kgCO",
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"text": "eq). Emissions are also lower than those from the best cheese and pork (4.5 kgCO",
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"text": " production than for other foods. This is because there are large differences in the intensity and practices used in ruminant livestock, and fish farming across the world. This is different from poultry and pig farming: 61% of pork, 81% of chicken and 86% of eggs are produced intensively in industrial-farm settings.{ref}MacLeod, M., Gerber, P., Mottet, A., Tempio, G., Falcucci, A., Opio, C., Vellinga, T., Henderson, B. & Steinfeld, H. (2013). ",
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"text": "But there are some general recommendations that are clear from the research: improving degraded pasture; improving lifetime animal productivity; increasing oxygen flow in aquaculture ponds, particularly in warm climates; and avoiding the conversion of ",
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"text": "\u201d (FAO, 2013).{/ref} Land use change can play a large role in the final emissions; this means beef from South America often has a high footprint due to deforestation. Good pasture quality is also important: climate has a strong impact on this, but effective management practices can also make a difference; New Zealand, France and the UK are some examples where footprints are often lower.",
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2020-02-04 06:09:23 | 2023-02-05 10:08:30 | {} |
What is the best way to reduce the carbon footprint of our diet? I have [shown previously](https://ourworldindata.org/food-choice-vs-eating-local) that _what_ we choose to eat has the largest impact, making a bigger difference than how far our food has traveled, or how much packaging it’s wrapped in. This is because only a small fraction comes from transport and packaging and most of our food emissions come from processes on the farm, or from [land use](https://ourworldindata.org/land-use) change. Regardless of whether you compare the footprint of foods in terms of their [weight](https://ourworldindata.org/food-choice-vs-eating-local) (e.g. one kilogram of cheese versus one kilogram of peas); [protein content](https://ourworldindata.org/grapher/ghg-per-protein-poore) ; or [calories](https://ourworldindata.org/grapher/ghg-kcal-poore), the overall conclusion is the same: plant-based foods tend to have a lower carbon footprint than meat and dairy. In many cases a much smaller footprint. As an example: producing 100 grams of protein from peas [emits just](https://ourworldindata.org/grapher/ghg-per-protein-poore) 0.4 kilograms of carbon dioxide equivalents (CO2eq). To get the same amount of protein from beef, emissions would be nearly 90 times higher, at 35 kgCO2eq.{ref}The mean emissions from beef very much depend on whether it’s sourced from dairy herds or from dedicated beef herds. Beef from dairy herds tends to have a lower footprint since its footprint is essentially ‘shared’ with dairy co-products. The mean footprint of beef from dairy herds is 17 kgCO2eq; from dedicated beef herds it’s 50 kgCO2eq. Around 56% of global beef production comes from dedicated beef herds; and 44% from dairy herds. The mean footprint is approximately 35 kgCO2eq [56% * 50 + 44% *17 = 35 kgCO2eq]. Note that if you use the _median_ footprint, this figure is 25 kgCO2eq – more than 60 times higher than peas.{/ref} But it comes with the caveat that comparisons are made based on global averages. Many argue that this overlooks the large variation in the footprints of foods across the world. Using global averages might give us a misleading picture for some parts of the world or some producers. If I source my beef or lamb from low-impact producers, could they have a lower footprint than plant-based alternatives? The evidence suggests, no: plant-based foods emit fewer greenhouse gases than meat and dairy, regardless of how they are produced. Let’s take a look at the full range of footprints for protein-rich foods. Protein-rich foods account for the bulk of our dietary emissions. In European diets, meat, dairy and eggs account for 83%.{ref}Sandström, V., Valin, H., Krisztin, T., Havlík, P., Herrero, M., & Kastner, T. (2018). The role of trade in the greenhouse gas footprints of EU diets. _Global Food Security_, _19_, 48-55.{/ref} That’s why I focus on them here. In the visualization we see the range of carbon footprints for these foods. This data is from the largest meta-analysis of global food systems to date, published in _Science_ by Joseph Poore and Thomas Nemecek (2018).{ref}Poore, J., & Nemecek, T. (2018). [Reducing food’s environmental impacts through producers and consumers](https://science.sciencemag.org/content/360/6392/987). _Science_, 360(6392), 987-992.{/ref} In this study, the authors looked at data across more than 38,000 commercial farms in 119 countries. All greenhouse gas (GHG) emissions are measured in kilograms of carbon dioxide equivalents per 100 grams of protein; this metric takes account of not only carbon dioxide but also the range of other greenhouse gases – this is further explained in the footnote.{ref}CO2 is the most important GHG, but not the only one – agriculture is a large source of the greenhouse gases methane and nitrous oxide. To capture all GHG emissions from food production researchers therefore express them in kilograms of ‘carbon dioxide equivalents’. To express all greenhouse gases in carbon dioxide equivalents (CO2-eq), they are each weighted by their [global warming potential](https://ourworldindata.org/co2-and-other-greenhouse-gas-emissions#global-warming-potential-of-greenhouse-gases) (GWP) value. GWP measures the relative warming impact one molecule or unit mass of a greenhouse gas relative to carbon dioxide over a given timescale – usually over 100 years. GWP100 values are used to combine greenhouse gases into a single metric of emissions called carbon dioxide equivalents (CO2eq). CO2eq is then derived by multiplying the mass of emissions of a specific greenhouse gas by its equivalent GWP100 factor. The sum of all gases in their CO2eq form provide a measure of total greenhouse gas emissions.{/ref} To make reading less repetitive, I refer to it as ‘kgCO2eq’ below. The visualization shows the median footprint – highlighted by a small white circle for each food product. But since there are large differences between producers, this chart also shows the full spectrum of emissions – from the lowest to highest producers. The height at each point in the curve represents the amount of global production with that specific footprint. The median footprint for beef is 25 kgCO2eq.{ref}This 25 kgCO2eq figure represents the _median_ emissions from beef production. You might notice that this is lower than our earlier figure of 35 kgCO2eq – this represents the _mean_ emissions from beef. Because of the skew in production – a small number of producers create most impact – the mean and median values can be quite different.{/ref} But some producers have a much higher footprint: ten percent emit more than 105 kgCO2eq per 100 grams. At the other end, some are much lower. Ten percent emit less than 9 kgCO2eq. We see from the height of the curve that most beef production lies in the range between 17 to 27 kgCO2eq. How do the distributions between plant-based and meat-based sources compare? Plant-based protein sources – tofu, beans, peas and nuts – have the lowest carbon footprint. This is certainly true when you compare average emissions. But it’s still true when you compare the extremes: there’s not much overlap in emissions between the _worst_ producers of plant proteins, and the _best_ producers of meat and dairy. Let’s compare the highest-impact producers (the top ten percent) of plant-based proteins with the lowest-impact producers (the bottom ten percent) of meat and dairy. The pea producers with the highest footprint emit just 0.8 kgCO2eq per 100 grams of protein.{ref}Here, by ‘largest impact’ I have taken the 90th percentile value. This means that 90% of global pea, tofu or nut production has a carbon footprint less than this figure.{/ref} For nuts it is 2.4 and for tofu, 3.5 kgCO2eq. All are several times less than the lowest impact lamb (12 kgCO2eq) and beef (9 kgCO2eq). Emissions are also lower than those from the best cheese and pork (4.5 kgCO2eq); and slightly lower or comparable to those from the lowest-footprint chicken (2.4 kgCO2eq).{ref}Here, by ‘lowest impact’ I have taken the 10th percentile value. This means that only 10% of global production has a carbon footprint below this figure.{/ref} If you want a lower-carbon diet, eating _less _meat is nearly always better than eating the _most sustainable_ meat. This is also true for the differences _between_ meat products. Chicken, eggs, and pork nearly always have a lower footprint than beef and lamb: there is some, but not much overlap between the _worst_ poultry and pork producers, and the _best_ beef and lamb producers. The world’s highest impact chicken and pork have a footprint of 12 and 14 kgCO2eq. This is similar to, or only slightly higher than, the world’s best beef and lamb. Regardless of where you get your beef or lamb from, substituting with chicken and pork is likely to reduce your carbon footprint. <Image filename="Carbon-footprint-of-protein-foods-2.png" alt=""/> ## More sustainable meat production can still make a big difference Eating less meat, or switching to lower impact meats such as chicken, eggs or pork is the most effective way for individuals to reduce their dietary footprint. But if you want to eat meat, then the choice of meat also matters. Consumers can have an impact, but so can food producers. The world is not going to abandon livestock farming completely – at least not any time soon. And there are a number of reasons we wouldn’t want it to: it is not only an important [source of income](https://ourworldindata.org/grapher/share-of-the-labor-force-employed-in-agriculture) for many, but can also be a key source of nutrition in local settings. Particularly in lower-income countries where [diets lack diversity](https://ourworldindata.org/grapher/dietary-compositions-by-commodity-group?country=BGD), small amounts of meat and dairy can be an essential source of protein and [micronutrients](https://ourworldindata.org/micronutrient-deficiency). Globally, greenhouse gas emissions are massively skewed towards high-impact producers. This can be seen at the bottom of our visualization. The red curve shows the sum of all protein products. Most of the protein we produce is relatively low-impact: 75% of production has a footprint between -3 and 11 kgCO2eq per 100 grams of protein. This creates just 30% of protein’s emissions. High-impact production – with a footprint greater than 11 kgCO2eq – produces just 25% of our protein, but 70% of its emissions. To put this ‘high-impact production’ in context: the top quarter of protein production emits more than five billion tonnes of CO2eq each year. This is more than the EU’s _total_ annual [greenhouse gas emissions](https://ourworldindata.org/co2-and-other-greenhouse-gas-emissions) from all sectors.{ref}The European Environment Agency [reports that](https://www.eea.europa.eu/data-and-maps/data/data-viewers/greenhouse-gases-viewer) the EU’s total greenhouse gas emissions in 2017 were approximately 4.5 billion tonnes of carbon dioxide equivalents.{/ref} Much of this skew, as we’ve already discussed, comes from the differences between plant-based sources and meats such as beef and lamb. But a lot comes from the large variations in footprint for specific products. There is much more variation in the footprints of beef, lamb, dairy, and [aquaculture](https://ourworldindata.org/seafood-production#how-is-our-seafood-produced) production than for other foods. This is because there are large differences in the intensity and practices used in ruminant livestock, and fish farming across the world. This is different from poultry and pig farming: 61% of pork, 81% of chicken and 86% of eggs are produced intensively in industrial-farm settings.{ref}MacLeod, M., Gerber, P., Mottet, A., Tempio, G., Falcucci, A., Opio, C., Vellinga, T., Henderson, B. & Steinfeld, H. (2013). [Greenhouse gas emissions from pig and chicken supply chains – A global life cycle assessment](http://www.fao.org/3/i3460e/i3460e.pdf). _Food and Agriculture Organization of the United Nations (FAO)_, Rome.{/ref} These systems are very similar wherever they are in the world. One factor which explains a lot of the variation for beef is whether it’s sourced from a dairy herd (where the cattle also produce milk) or a herd dedicated to beef production. Just under half (44%) of the world’s beef comes from the dairy sector. And it produces 60% lower emissions because its footprint is shared with dairy co-products. Geography also plays a role in the large variations we see for beef, lamb and aquaculture: farming approaches are often adopted in line with local conditions such as soil fertility, terrain and temperature.{ref}German, R. N., Thompson, C. E., & Benton, T. G. (2017). [Relationships among multiple aspects of agriculture's environmental impact and productivity: a meta‐analysis to guide sustainable agriculture](https://onlinelibrary.wiley.com/doi/full/10.1111/brv.12251). _Biological Reviews_, _92_(2), 716-738.{/ref} Opportunities for food producers to reduce emissions are therefore very specific to local conditions. But there are some general recommendations that are clear from the research: improving degraded pasture; improving lifetime animal productivity; increasing oxygen flow in aquaculture ponds, particularly in warm climates; and avoiding the conversion of [forests](https://ourworldindata.org/forests) and peatlands for agriculture will all make a difference.{ref}Gerber, H. Steinfeld, B. Henderson, A. Mottet, C. Opio, J. Dijkman, A. Falcucci, G. Tempio, “[Tackling climate change through livestock: A global assessment of emissions and mitigation opportunities](http://www.fao.org/3/a-i3437e.pdf)” (FAO, 2013).{/ref} Land use change can play a large role in the final emissions; this means beef from South America often has a high footprint due to deforestation. Good pasture quality is also important: climate has a strong impact on this, but effective management practices can also make a difference; New Zealand, France and the UK are some examples where footprints are often lower. If we want to reduce the emissions from our food, there is massive scope for both consumers and producers. For producers, understanding and adopting best farm and land management practices can mitigate the highest impacts of production. As consumers, the biggest difference we can make is to eat more plant-based sources of protein such as tofu, nuts, peas, and beans. This is the case regardless of where you are in the world. | {
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"content": "\n<p>What is the best way to reduce the carbon footprint of our diet?</p>\n\n\n\n<p>I have <a href=\"https://ourworldindata.org/food-choice-vs-eating-local\">shown previously</a> that <em>what</em> we choose to eat has the largest impact, making a bigger difference than how far our food has traveled, or how much packaging it\u2019s wrapped in. This is because only a small fraction comes from transport and packaging and most of our food emissions come from processes on the farm, or from <a href=\"https://ourworldindata.org/land-use\">land use</a> change.</p>\n\n\n\n<p>Regardless of whether you compare the footprint of foods in terms of their <a href=\"https://ourworldindata.org/food-choice-vs-eating-local\">weight</a> (e.g. one kilogram of cheese versus one kilogram of peas); <a href=\"https://ourworldindata.org/grapher/ghg-per-protein-poore\">protein content</a> ; or <a href=\"https://ourworldindata.org/grapher/ghg-kcal-poore\">calories</a>, the overall conclusion is the same: plant-based foods tend to have a lower carbon footprint than meat and dairy. In many cases a much smaller footprint.</p>\n\n\n\n<p>As an example: producing 100 grams of protein from peas <a href=\"https://ourworldindata.org/grapher/ghg-per-protein-poore\">emits just</a> 0.4 kilograms of carbon dioxide equivalents (CO<sub>2</sub>eq). To get the same amount of protein from beef, emissions would be nearly 90 times higher, at 35 kgCO<sub>2</sub>eq.{ref}The mean emissions from beef very much depend on whether it\u2019s sourced from dairy herds or from dedicated beef herds. Beef from dairy herds tends to have a lower footprint since its footprint is essentially \u2018shared\u2019 with dairy co-products. The mean footprint of beef from dairy herds is 17 kgCO<sub>2</sub>eq; from dedicated beef herds it\u2019s 50 kgCO<sub>2</sub>eq. Around 56% of global beef production comes from dedicated beef herds; and 44% from dairy herds. The mean footprint is approximately 35 kgCO<sub>2</sub>eq [56% * 50 + 44% *17 = 35 kgCO<sub>2</sub>eq]. Note that if you use the <em>median</em> footprint, this figure is 25 kgCO<sub>2</sub>eq \u2013 more than 60 times higher than peas.{/ref}</p>\n\n\n\n<p>But it comes with the caveat that comparisons are made based on global averages.</p>\n\n\n\n<p>Many argue that this overlooks the large variation in the footprints of foods across the world. Using global averages might give us a misleading picture for some parts of the world or some producers. If I source my beef or lamb from low-impact producers, could they have a lower footprint than plant-based alternatives?<br><br>The evidence suggests, no: plant-based foods emit fewer greenhouse gases than meat and dairy, regardless of how they are produced.</p>\n\n\n\n<p>Let\u2019s take a look at the full range of footprints for protein-rich foods. </p>\n\n\n\n<p>Protein-rich foods account for the bulk of our dietary emissions. In European diets, meat, dairy and eggs account for 83%.{ref}Sandstr\u00f6m, V., Valin, H., Krisztin, T., Havl\u00edk, P., Herrero, M., & Kastner, T. (2018). The role of trade in the greenhouse gas footprints of EU diets.\u00a0<em>Global Food Security</em>,\u00a0<em>19</em>, 48-55.{/ref} That\u2019s why I focus on them here.</p>\n\n\n\n<p>In the visualization we see the range of carbon footprints for these foods. This data is from the largest meta-analysis of global food systems to date, published in <em>Science</em> by Joseph Poore and Thomas Nemecek (2018).{ref}Poore, J., & Nemecek, T. (2018). <a href=\"https://science.sciencemag.org/content/360/6392/987\">Reducing food\u2019s environmental impacts through producers and consumers</a>. <em>Science</em>, 360(6392), 987-992.{/ref} In this study, the authors looked at data across more than 38,000 commercial farms in 119 countries.</p>\n\n\n\n<p>All greenhouse gas (GHG) emissions are measured in kilograms of carbon dioxide equivalents per 100 grams of protein; this metric takes account of not only carbon dioxide but also the range of other greenhouse gases \u2013 this is further explained in the footnote.{ref}CO<sub>2</sub> is the most important GHG, but not the only one \u2013 agriculture is a large source of the greenhouse gases methane and nitrous oxide. To capture all GHG emissions from food production researchers therefore express them in kilograms of \u2018carbon dioxide equivalents\u2019. </p>\n\n\n\n<p>To express all greenhouse gases in carbon dioxide equivalents (CO2-eq), they are each weighted by their <a href=\"https://ourworldindata.org/co2-and-other-greenhouse-gas-emissions#global-warming-potential-of-greenhouse-gases\">global warming potential</a> (GWP) value. GWP measures the relative warming impact one molecule or unit mass of a greenhouse gas relative to carbon dioxide over a given timescale \u2013 usually over 100 years. GWP100 values are used to combine greenhouse gases into a single metric of emissions called carbon dioxide equivalents (CO2eq). CO2eq is then derived by multiplying the mass of emissions of a specific greenhouse gas by its equivalent GWP100 factor. The sum of all gases in their CO2eq form provide a measure of total greenhouse gas emissions.{/ref} To make reading less repetitive, I refer to it as \u2018kgCO<sub>2</sub>eq\u2019 below. </p>\n\n\n\n<p>The visualization shows the median footprint \u2013 highlighted by a small white circle for each food product. </p>\n\n\n\n<p>But since there are large differences between producers, this chart also shows the full spectrum of emissions \u2013 from the lowest to highest producers. The height at each point in the curve represents the amount of global production with that specific footprint.</p>\n\n\n\n<p>The median footprint for beef is 25 kgCO<sub>2</sub>eq.{ref}This 25 kgCO<sub>2</sub>eq figure represents the <em>median</em> emissions from beef production. You might notice that this is lower than our earlier figure of 35 kgCO<sub>2</sub>eq \u2013 this represents the <em>mean</em> emissions from beef. Because of the skew in production \u2013 a small number of producers create most impact \u2013 the mean and median values can be quite different.{/ref} But some producers have a much higher footprint: ten percent emit more than 105 kgCO<sub>2</sub>eq per 100 grams. At the other end, some are much lower. Ten percent emit less than 9 kgCO<sub>2</sub>eq. We see from the height of the curve that most beef production lies in the range between 17 to 27 kgCO<sub>2</sub>eq.</p>\n\n\n\n<p>How do the distributions between plant-based and meat-based sources compare?</p>\n\n\n\n<p>Plant-based protein sources \u2013 tofu, beans, peas and nuts \u2013 have the lowest carbon footprint. This is certainly true when you compare average emissions. But it\u2019s still true when you compare the extremes: there\u2019s not much overlap in emissions between the <em>worst</em> producers of plant proteins, and the <em>best</em> producers of meat and dairy.</p>\n\n\n\n<p>Let\u2019s compare the highest-impact producers (the top ten percent) of plant-based proteins with the lowest-impact producers (the bottom ten percent) of meat and dairy.</p>\n\n\n\n<p>The pea producers with the highest footprint emit just 0.8 kgCO<sub>2</sub>eq per 100 grams of protein.{ref}Here, by \u2018largest impact\u2019 I have taken the 90th percentile value. This means that 90% of global pea, tofu or nut production has a carbon footprint less than this figure.{/ref} For nuts it is 2.4 and for tofu, 3.5 kgCO<sub>2</sub>eq. All are several times less than the lowest impact lamb (12 kgCO<sub>2</sub>eq) and beef (9 kgCO<sub>2</sub>eq). Emissions are also lower than those from the best cheese and pork (4.5 kgCO<sub>2</sub>eq); and slightly lower or comparable to those from the lowest-footprint chicken (2.4 kgCO<sub>2</sub>eq).{ref}Here, by \u2018lowest impact\u2019 I have taken the 10th percentile value. This means that only 10% of global production has a carbon footprint below this figure.{/ref}</p>\n\n\n\n<p>If you want a lower-carbon diet, eating <em>less </em>meat is nearly always better than eating the <em>most sustainable</em> meat.</p>\n\n\n\n<p>This is also true for the differences <em>between</em> meat products. Chicken, eggs, and pork nearly always have a lower footprint than beef and lamb: there is some, but not much overlap between the <em>worst</em> poultry and pork producers, and the <em>best</em> beef and lamb producers. The world\u2019s highest impact chicken and pork have a footprint of 12 and 14 kgCO<sub>2</sub>eq. This is similar to, or only slightly higher than, the world\u2019s best beef and lamb.</p>\n\n\n\n<p>Regardless of where you get your beef or lamb from, substituting with chicken and pork is likely to reduce your carbon footprint.</p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"2678\" height=\"2613\" src=\"https://owid.cloud/app/uploads/2020/02/Carbon-footprint-of-protein-foods-2.png\" alt=\"\" class=\"wp-image-29926\" srcset=\"https://owid.cloud/app/uploads/2020/02/Carbon-footprint-of-protein-foods-2.png 2678w, https://owid.cloud/app/uploads/2020/02/Carbon-footprint-of-protein-foods-2-400x390.png 400w, https://owid.cloud/app/uploads/2020/02/Carbon-footprint-of-protein-foods-2-564x550.png 564w, https://owid.cloud/app/uploads/2020/02/Carbon-footprint-of-protein-foods-2-150x146.png 150w, https://owid.cloud/app/uploads/2020/02/Carbon-footprint-of-protein-foods-2-768x749.png 768w, https://owid.cloud/app/uploads/2020/02/Carbon-footprint-of-protein-foods-2-1536x1499.png 1536w, https://owid.cloud/app/uploads/2020/02/Carbon-footprint-of-protein-foods-2-2048x1998.png 2048w\" sizes=\"(max-width: 2678px) 100vw, 2678px\" /></figure>\n\n\n\n<h4>More sustainable meat production can still make a big difference</h4>\n\n\n\n<p>Eating less meat, or switching to lower impact meats such as chicken, eggs or pork is the most effective way for individuals to reduce their dietary footprint.</p>\n\n\n\n<p>But if you want to eat meat, then the choice of meat also matters. Consumers can have an impact, but so can food producers.</p>\n\n\n\n<p>The world is not going to abandon livestock farming completely \u2013 at least not any time soon. And there are a number of reasons we wouldn\u2019t want it to: it is not only an important <a href=\"https://ourworldindata.org/grapher/share-of-the-labor-force-employed-in-agriculture\">source of income</a> for many, but can also be a key source of nutrition in local settings. Particularly in lower-income countries where <a href=\"https://ourworldindata.org/grapher/dietary-compositions-by-commodity-group?country=BGD\">diets lack diversity</a>, small amounts of meat and dairy can be an essential source of protein and <a href=\"https://ourworldindata.org/micronutrient-deficiency\">micronutrients</a>.</p>\n\n\n\n<p>Globally, greenhouse gas emissions are massively skewed towards high-impact producers. This can be seen at the bottom of our visualization. The red curve shows the sum of all protein products. </p>\n\n\n\n<p>Most of the protein we produce is relatively low-impact: 75% of production has a footprint between -3 and 11 kgCO<sub>2</sub>eq per 100 grams of protein. This creates just 30% of protein\u2019s emissions.</p>\n\n\n\n<p>High-impact production \u2013 with a footprint greater than 11 kgCO<sub>2</sub>eq \u2013 produces just 25% of our protein, but 70% of its emissions. To put this \u2018high-impact production\u2019 in context: the top quarter of protein production emits more than five billion tonnes of CO<sub>2</sub>eq each year. This is more than the EU\u2019s <em>total</em> annual <a href=\"https://ourworldindata.org/co2-and-other-greenhouse-gas-emissions\">greenhouse gas emissions</a> from all sectors.{ref}The European Environment Agency <a href=\"https://www.eea.europa.eu/data-and-maps/data/data-viewers/greenhouse-gases-viewer\">reports that</a> the EU\u2019s total greenhouse gas emissions in 2017 were approximately 4.5 billion tonnes of carbon dioxide equivalents.{/ref}</p>\n\n\n\n<p>Much of this skew, as we\u2019ve already discussed, comes from the differences between plant-based sources and meats such as beef and lamb. But a lot comes from the large variations in footprint for specific products.</p>\n\n\n\n<p>There is much more variation in the footprints of beef, lamb, dairy, and <a href=\"https://ourworldindata.org/seafood-production#how-is-our-seafood-produced\">aquaculture</a> production than for other foods. This is because there are large differences in the intensity and practices used in ruminant livestock, and fish farming across the world. This is different from poultry and pig farming: 61% of pork, 81% of chicken and 86% of eggs are produced intensively in industrial-farm settings.{ref}MacLeod, M., Gerber, P., Mottet, A., Tempio, G., Falcucci, A., Opio, C., Vellinga, T., Henderson, B. & Steinfeld, H. (2013). <a href=\"http://www.fao.org/3/i3460e/i3460e.pdf\">Greenhouse gas emissions from pig and chicken supply chains \u2013 A global life cycle assessment</a>. <em>Food and Agriculture Organization of the United Nations (FAO)</em>, Rome.{/ref} These systems are very similar wherever they are in the world.</p>\n\n\n\n<p>One factor which explains a lot of the variation for beef is whether it\u2019s sourced from a dairy herd (where the cattle also produce milk) or a herd dedicated to beef production. Just under half (44%) of the world\u2019s beef comes from the dairy sector. And it produces 60% lower emissions because its footprint is shared with dairy co-products.</p>\n\n\n\n<p>Geography also plays a role in the large variations we see for beef, lamb and aquaculture: farming approaches are often adopted in line with local conditions such as soil fertility, terrain and temperature.{ref}German, R. N., Thompson, C. E., & Benton, T. G. (2017). <a href=\"https://onlinelibrary.wiley.com/doi/full/10.1111/brv.12251\">Relationships among multiple aspects of agriculture’s environmental impact and productivity: a meta\u2010analysis to guide sustainable agriculture</a>. <em>Biological Reviews</em>, <em>92</em>(2), 716-738.{/ref} Opportunities for food producers to reduce emissions are therefore very specific to local conditions.</p>\n\n\n\n<p>But there are some general recommendations that are clear from the research: improving degraded pasture; improving lifetime animal productivity; increasing oxygen flow in aquaculture ponds, particularly in warm climates; and avoiding the conversion of <a href=\"https://ourworldindata.org/forests\">forests</a> and peatlands for agriculture will all make a difference.{ref}Gerber, H. Steinfeld, B. Henderson, A. Mottet, C. Opio, J. Dijkman, A. Falcucci, G. Tempio, \u201c<a href=\"http://www.fao.org/3/a-i3437e.pdf\">Tackling climate change through livestock: A global assessment of emissions and mitigation opportunities</a>\u201d (FAO, 2013).{/ref} Land use change can play a large role in the final emissions; this means beef from South America often has a high footprint due to deforestation. Good pasture quality is also important: climate has a strong impact on this, but effective management practices can also make a difference; New Zealand, France and the UK are some examples where footprints are often lower.</p>\n\n\n\n<p>If we want to reduce the emissions from our food, there is massive scope for both consumers and producers. For producers, understanding and adopting best farm and land management practices can mitigate the highest impacts of production.</p>\n\n\n\n<p>As consumers, the biggest difference we can make is to eat more plant-based sources of protein such as tofu, nuts, peas, and beans. This is the case regardless of where you are in the world.</p>\n"
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