The world is rapidly approaching an unprecedented catastrophe from global climate change and other environmental threats, and a major societal shift to plant-based (vegan) diets is an essential part of the necessary responses to avoid that catastrophe. Since methane emitted by farmed animals is in the atmosphere for less than 20 years and is 72 times as potent as a greenhouse gas than carbon dioxide during that time, reducing the number of farmed animals would have a major, rapid effect in reducing climate change. A major shift to plant-centered diets would have many other benefits, including reducing diseases, hunger, water and energy shortages, rapid species extinction, water pollution, destruction of rainforests and other valuable habitats and soil erosion and depletion.
Global catastrophe or sustainable future? by Richard H. Schwartz, Veg Climate Alliance