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.
There have been multiple scientific studies asking whether vegans get enough protein. The conclusion is always that they do. Here is one of them.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6893534/
I didn’t say they don’t, I said it’s difficult for people who don’t know how. You have to spend time on education when you go vegan.