Cows are often described as climate change criminals because of how much planet-warming methane they burp. But there's another problem with livestock farming that's even worse for the climate and easier to overlook: To feed the world's growing appetite for meat, corporations and ranchers are chopping down more forests and trampling more carbon-sequestering grasslands to make room for pastures and fields of hay. Ruminants, like cattle, sheep and goats, need space to graze and animal feed needs space to grow. The greenhouse gases unleashed by this deforestation and land degradation mean food systems account for one-third of the world's human-generated climate pollution.
Environmental advocates have long argued that there's a straightforward solution to this mess: Eat less meat. Convincing more people to become vegetarians is a very effective way to limit emissions. Getting rid of meat is one question; replacing it is another. A paper published on Tuesday seeks to address both, finding that giving up meat in favor of meatlike plant products would yield significant benefits for the climate, biodiversity and even food security in coming decades.
