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.
Even better results can be achieved by unaliving yourself.
Also in case anyone wanted to know without reading the paper they define “high” meat eaters as “(≥100 g d−1)” so I assume more then 100grams a day.