Researchers have linked dietary data from over 55,000 individuals with data on the environmental impacts of the foods they eat. The team, from the Livestock, Environment and People (LEAP) project at the University of Oxford, found that the dietary impacts of vegans were around a third of those of high meat eaters. They also saw a 30% difference between high- and low-meat diets for most of the measures of environmental harm.
Of course this is just one anecdote, but I stopped eating meat for the climate, because of the numbers. People posting papers, making informative comments (like your first half) changed my mind.
Same, it’s one of the good things that I got from being on Reddit/Feddit.