The only thing that might save civilisation at this point is some kind of magic carbon capture technology.

Or a giant sun shade.

Or perhaps planetary-scale reforesting. But that's more speculative.

We passed the "we need to reduce emissions" marker at least a decade ago.

Emissions don't just need to be reduced, they need to be objectively greenhouse gas negative for a good long while. Meaning centuries.

If that doesn't happen - and it's looking really unlikely - catastrophic change is locked in.

The result will be population destruction at a scale never seen in all of recorded history. That's going to do more to minimise emissions than veganism will.