Howdy C2 FDI and welcome to the forums!
When people see hunters, they only see them taking the resource. They do no realize what they give back. Hunters were the first conservationists in America, and they are still the leading conservationists in America. Environmentalists may talk big, but they don't actually contribute much to the cause. All hunters can do is argue the facts to negate any effects the environmentalists might have on main-stream America. You probably won't have much luck changing an environmentalists mind, but you can influence everyone else.
Here are some links that might help:
Boone and Crockett Club
National Shooting Sports Foundation
Ducks Unlimited
Texas Parks and Wildlife
Sportsmen and Conservation
National Rifle Association