No, you can be a conservationist and a conservative. Environmentalism is a political movement that has not so much to do with the environment as it does with control of the people and government interference in every part of our lives.
if you want to understand the environmental movement, you should read Stanley Kurtz, new book, The Radical in Chief, the untold story of Obama’s war on the suburbs. It’s about the real agenda behind the environmental movement, to spread the costs of the inner cities to the suburbs, for the water, the sewage and trash disposal as well as for the First Responders.
I just detest the left’s having hijacked those phrases (conservationism and environmentalism) and perverted them. Same goes for the term, “(classic) liberal”, which is what “Conservatism” is today. They hijack and ruin everything they touch.