And just to be clear, this is a fictional scenario, it will not happen. The only thing that might make a real difference is if everyone on the planet gets together and collectively make huge changes to modern society. Obviously this also won't happen but I'd stand behind it if it did.
Go right ahead and outlaw beef, I love it but I can live without it if I have to. Go ahead and tax the biggest emitters, we'll have to pay more for things but I can live with that. Go ahead and do anything that can help improve our situation on a national or international scale and I'll support it.
But as long as we can buy beef in the store with no limits, buy cars with unnecessarily large combustion engines, fly around the world at our whim - people will. And it's not just these few popularized things we need to change. Everything needs to change. Where we produce things, how we produce them, the materials we produce them from. It's an enormous problem that I honestly don't expect us to be able to solve.