We don't know enough about the carbon footprint of vegan foods, and that needs to change.
vegan burgers with mushroom 'buns'on a plate

Are veggie burgers the way of the future? Credit: Ella Olsson/Flickr, CC BY-SA

The IPCC special report, Climate Change and Land, released late last year, has found a third of the world’s greenhouse gas emissions come from the “land”: largely farming, food production, land clearing and deforestation.

Sustainable farming is a major focus of the report, as plants and soil can potentially hold huge amounts of carbon. But it’s incredibly difficult as a consumer to work out the overall footprint of individual products, because they don’t take these considerations into account.

Two vegan brands have published reports on the environmental footprint of their burgers. Impossible Foods claims its burger requires 87% less water and 96% less land, and produces 89% fewer greenhouse-gas emissions than a beef version. Additionally, it would contribute 92% less aquatic pollutants.

Similarly, Beyond Meat claims its burger requires 99% less water, 93% less land, 90% fewer greenhouse emissions and 46% less energy than a beef burger.

But these results have focused on areas where vegan products perform well, and do not account for soil carbon or potential deforestation. This might change the picture.

How do you measure an environmental footprint?

Vegan and vegetarian “meat alternatives” have become increasingly popular. Often in the form of burgers, the products are meant to emulate the taste, nutritional value, “mouthfeel” and even the cooking experience of a meat burger. The aim is to provide the consumer with products that are like meat in all respects except one: their environmental impact.

Impossible Foods and Beyond Meat have each published “life-cycle assessments” (LCA), which measure environmental aspects of products over the supply chain. As is clear from the figures quoted above, both claim their burgers use a fraction of the resources of traditional beef burgers.

These results sound impressive, but LCA results can be misleading when taken out of context. Looking at the underlying reports for Beyond Burger and Impossible Burger it becomes clear that statements such as “less water” and “less land” mean different things in practice.

There are significant differences between the two studies in the calculations of land and water use for the beef burger, and the final results are not expressed in the same units. This does not necessarily mean either of the studies is invalid, but it does mean the statements on the websites are simplified and don’t allow for clear interpretation.

Both studies justify their choice of indicators by saying they are the most common used in beef footprint studies. But are they the most relevant indicators for vegan burger production?

By making the comparison only for the environmental aspects most important for meat products, the results may look extra positive for the vegan alternatives, as other aspects might have shown a less favourable result. The results as presented may be true, but they are not the whole truth.

Importantly, the studies compare the results for the vegan burgers with a beef burger produced in the United States. To be precise, it is produced from cattle from average, conventional US production systems.

This is a valid choice, because this is the default burger meat in the US market. But results may be very different for other animals, for beef in other countries, or for unconventionally farmed beef.

Unconventional beef

A third study, released recently, evaluates beef produced at White Oak Pastures, a regenerative grazing farm in the US. Regenerative grazing uses adjusted animal grazing to enrich soils and improve biodiversity, water and nutrient cycling.

The White Oak farm sequesters so much carbon in its soil and vegetation it more than offsets the emissions of its cattle. In other words, it has a negative carbon footprint. This study compared White Oak beef favourably to conventional beef, chicken, pork and soy, as well as the Beyond Burger.

The silent assumption is, however, that no carbon sequestration occurs in conventional beef grazing or on feed and soy cropping land. This is not necessarily true. White Oak Pastures is using grazing to regenerate degraded cropland, so it is likely similar grazing on other farms would result in holding additional carbon within the first few decades.

In Australia, farmers who convert their cropland to pasture (which stores more carbon) are eligible for credits under the Emissions Reduction Fund. There is also evidence cropping systems may sometimes hold carbon as well, in the US as well as in Australia. For example, the carbon footprint of Australian barley and canola may be some 10% smaller when taking carbon sequestration in soils into account.

Clearly, soil carbon can play a major role in the net carbon footprint of many foods. How would the vegan burger versus beef burger comparison look if soil carbon and biodiversity aspects had been included?

That said, the White Oak Pastures study does not present the full story either, because soil carbon sequestration was only evaluated for their own product, and the study didn’t look at any other aspects such as water scarcity or biodiversity.

It is disappointing such prominent products don’t publish more comprehensive environmental results, given that this has long been prescribed by the international standards.

Now that the new special report stresses yet again how important soils are in a transition to sustainable agriculture and food, it’s time to do better.The Conversation

This article is republished from The Conversation under a Creative Commons license. Read the original article.


  1. It’s complicated – and that’s before looking at “food miles”. Is it better to consume food that is produced locally (but not necessarily efficiently – with the addition of fertiliser and soil improvers) or further away (in an environment that is better suited to that particular crop)? It all comes down to the sheer numbers of humans that inhabit this planet; and that’s something that governments aren’t game to address… so, like it or not, those of us enjoying a “Western” lifestyle are going to have to start making some very big concessions

  2. Animal agriculture is the 2nd largest generator of greenhouse gases according to the UN.http://www.fao.org/news/story/en/item/197623/icode/ http://www.fao.org/3/i3437e/i3437e03.pdf

  3. Join a Community Supported Agriculture Farm, avoid supermarkets and processed food, grow your own tucker and dreads, and be critical of anything you read, exercise daily and smile at your neighbours, and your days will read like Yogi Tea mantra messages.

  4. I have now had a made in Ireland vegan cottage pie. Quite tasty, reasonable price for pre-prepared single meal. Does not convert me to total vegan. Won’t expect to see it on the menu at those restaurants that underpay staff.

  5. People want to prove something, but everyone has some bias. The problem is that these studies never take into account all factors and relationships. Nature’s cycle is such that every single interaction has an important function somewhere else. Nothing can ever be proven or understood without a thorough understanding of each process – and there’s just too many because Earth is a genius and no mere man (or woman) can compete – look at the stuff ups based on his attempts to do so – and then when trying to rectify them. Science doesn’t take all things into account and puts a few small grains of sand under a microscope – but how many grains are there in total? Does anyone know for certain? Are there grains not classified as grains that should be, or grains classified as grains that should not be? People often justify their emotional responses and prejudices with reason and logic (and statistics). What a mess. I defer to the bees.

Commenting on this post has been disabled.