Prohibition doesn't change the sum total of misery in the world, it just evenly distributes it. The only way to reduce the total amount of misery is to increase the standard of living of more people. Everyone should be able to eat delicious cow and drive SUVs if they want to. The problem to solve is in how we reduce the harm those things currently have on the environment, there are many options for that other than "just take away the SUVs and cows so no one has them".