Veganism is a good idea that would make an impact. It wouldn't replace sharply slashing fossil fuels—we MUST do that soon, ideally right now! And, if we don't go fully vegan, we certainly need to end using grazing animals like cows as part of our diets. Both CO2 and our methods of food production are big critical problems that must be fully addressed.
We are running out of time and what we are doing right now (still!) is insane.
