You reckon there will be enough vegetables and grain to suddenly feed 7.6 billion people? Yes see my post above. Who will you get to produce and pick it, we already produce enough to feed everyone, but we waste large amount of this feeding it to livestock who we then eat, which is not an efficient use of resources, how do you think they harvest this now? machines that produces even MORE greenhouse gases. Look at stats above comparing CO2 emissions from plant based v meat based diet. Speaking of farmers, how will you get around the growing urban population issues and building on green belt land and couple it with needing the same additional land for the new produce we'd need to create? Meat production uses more resouces than crops, so if you are worried about the environment & the green belt, surely the best thing you can do is go plant based?
What about world governments? If it was cheaper, more profitable and easier for society to be based on a Vegan diet wouldn't they have done it by now? I never said any diet was more profitable than the other. Animal agriculture is big business. Most of the world, particulary the poorer countries live on a mostly plant based diet now,people are starving because richer countried buy grain to feed cattle, as we can pay more money for it than the poor people. Look up how much animal agriculture is subsidised At the very least it must have been contemplated, research done and the outcome was one that was so outlandish and pie-in-the-sky to ever do, they rejected the notion to just carry on as usual? Read the research, most people agree that animal agriculture is less sustainable than plant based. What would happen to the 1.5 billion cows on the planet? There are only so may cattle because we artificially breed them for food, if we stopped doing that there wouldn't be 1.5 billion cattle, they aren't breeding naturally. Also everyone isn't going to suddenly go vegan overnight, it would have to be a gradual phased out approach. Who would dispose of their corpses upon natural death? How would they be fed, areas to graze would need to be laid out, unless you advocate a mass culling to bring the numbers down, which kind of defeats the purpose, doesn't it?
All hypothetical, obviously, but I wonder if the "Meat is Murder" crowd have taken these issues into account.