A staggering 51 percent or more of global greenhouse-gas emissions are caused by animal agriculture, so eating as much meat globally as we do is a problem. Along with the cruel treatment of animals, the traditional way we produce meat is significantly contributing to global warming.
Microorganisms in the guts of cattle emit millions of tonnes of methane every year. A typical cow releases 100 kilograms of methane a year and the world has about a billion of them. Since methane is a greenhouse gas, this exacerbates global warming.
Meanwhile, feeding the cattle destroys forests by taking land for pasture or to grow feed. This deforestation additionally contributes to greenhouse gas emissions.