First of all, his letter does not make sense. He discusses many different issues without really supporting a main point. I would like to say that eating a hamburger is not going to cause a wildlife species to cease to exist or abuse the use of grazing lands.
Cattlemen care about the environment.
They take care of the land because it is in their best interest to do so. Cattle use grass and other forages which are inedible to humans and convert them to a nutritious meat product full of protein, vitamins and minerals. About half the land area of the U.S. is strictly considered grazing land because it is not suitable for crop production. If this land were not used for grazing livestock it would be of no use as a food resource. Cattlemen want to preserve the land to assure the livelihood for future generations.