But without any meat-eating humans to provide a market, whole herds of domestic animals would disappear and that would free up a vast quantity of land.
The problem is, much of the land used for pasture is too dry to grow crops. Without humans adding any artificial nutrients, this land could turn to desert.
If properly managed, it’s possible that some farmland could return to its natural state of grassland or forests.
So, are there any downsides to a vegan diet? Well, we’d be left without a cheap source of livestock products like leather from animal hides or animal fats which are used in cosmetics, candles and detergents.
While there are vegetable alternatives, their production would need to increase, meaning more land dedicated to growing crops and less restored to its natural state.
Another problem is that raising and processing animals is a livelihood for more than 1 billion people, to which most would see their way of life become obsolete.
So, in full a vegan diet would be better and most scientists believe that a vegan diet would be the best way to fight climate change. But the whole world is not going to wake up a vegan tomorrow.