Feed the world on nuts? Come on. We will never be able to grow enough of them to do that. Peas and beans take up too much water resources to be viable, and peas and rice actually produce more greenhouse gases than animals, Not all plants are better for the planet so it will come down to a limited variety, mainly grains and starches, Forget Avacados, strawberries, blueberries, kale, cabbage, in fact greens of any kind since they need too much resource, Try algae, slime, and insects since these will be farmable on a large scale and need little energy or water resource. and they can feed off waste products as well, I see farmers with shotguns protecting their wormeries and compost heaps from protein hunters