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 is simply too much in life to care about. And we all care about different things. And nobody can care about all the things that we should care about. Even more so when caring about a cause involves making sacrifices in order to support that cause.
So without systemic change, you will never convince a critical mass of individuals to care enough to sacrifice enough to make a meaningful difference.
So the focus on the individual as the unit of change is as good as saying “do nothing”.