Let me say up front that I have nothing against treating the environment in a responsible manner. It’s implied by the commission God gave mankind in Genesis 1. I also try to avoid fights about words, so whether one would call a responsible environmental position “conservationism” or “environmentalism” is a thing that does not need to be fought about.
But there is a very prominent strand in the environmental movement that takes matters to extreme and anti-human limits. In a previous post, I have referred to this position as environmental fundamentalism, to distinguish it from healthy concern for the environment.