https://www.theguardian.com/environment/2018/may/31/avoiding-meat-and-dairy-is-single-biggest-way-to-reduce-your-impact-on-earth

Avoiding meat and dairy products is the single biggest way to reduce your environmental impact on the planet, according to the scientists behind the most comprehensive analysis to date of the damage farming does to the planet.

https://www.science.org/doi/10.1126/science.aba7357

We show that even if fossil fuel emissions were immediately halted, current trends in global food systems would prevent the achievement of the 1.5°C target and, by the end of the century, threaten the achievement of the 2°C target

E: Mind you, some of these numbers are already a few years old where there was no progress.

Its a multitude of reasons for people to go vegan: The animals, their own health, the probability of not creating a living hell on earth. The reason why vegans try to convince others is often because after a few years most are so disconnected from the killing of others for taste where it is a giant argument. The suffering and abuse of 90 billion sentient land animals per year alone is for most good enough to stop supporting it. I have surrendered that argument for most discussions because it is hard to have that empathy while it is a part in your live. It wasn’t for me, although is was not challenged in that view back then. So now my arguments moved more towards egoism which sometimes works.