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.
Moralizing and guilt-tripping is never going to work. People will dig their heels in harder or completely cut out your message as toxic and abusive (and let’s be honest, guilt-tripping is toxic and abusive shit and people who engage in it should be cut out of your life anyway).
Making items more accessible, available, and affordable is going to do more for your cause than turning a bunch of people away from you ever could.