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Most estimates put it at around 15%, not 5. Stopping climate change is going to require action on all these vectors, and diet is one of the easiest to change. It also has knock on effects like clear cutting rainforest to plant crops to feed to cows. On top of that it’s just cruel and unnecessary to go on eating so much meat.
The main argument in favor changing diet, to me, is the potential psychological and social effects. When something you do multiple times a day is different from what you used to do, and what many others around you do, it stays active in your thoughts and might trigger other, more meaningful activity. I don't know if this is actually true, but anecdotally at least it seems to be. The people around me who seem to be mo…
What do these people do? Unless they're working on renewables technology or carbon-capture technology, they're not doing anything useful. That's just how the math shakes out. The climate problem is so huge that only engineers and scientists can help us now. Everything else is just putting on one of those "raising awareness of breast cancer" ribbons.