I'm vegetarian, not vegan, and I don't expect people to stop eating meat, but fur trapping and farming is incredibly cruel. Far more cruel than a lot of other types of animal farming. On top of that, it's pretty wasteful. The pelt is used and the rest of the animal is disposed of.
It seems to me that in a case like this, averting cruelty would be the bigger thing. What kind of environmental impact can the fake fur industry have when contrasted with the environmental impact of, for example, the entire fossil fuel for generating electricity system? Because I'm guessing it's a tiny drop in a giant bucket and we can be more concerned with averting unnecessary cruelty here.