If most people were willing to change their diets overnight, maybe. Mathematically or statistically, irrelevant when you take into account real human beings. It's as disingenuous as saying "if everyone were nice, Earth would be paradise".

Soon enough, capitalism will force people to change their diets overnight. When 1lb of beef is $30, people will think twice what to eat for diner.

Now, whether it's carbon tax that'll force e.g. beef to go to its true cost, or climate change, that I don't know.

That doesn't sound much like a dietary 'choice' to me. I hope pricing can force the necessary changes in time. Honestly, I fully expect disaster levels sea level rise within my lifetime...