Hitler was an environmentalist. He was, it wasn’t the bedrock of his ideology,; but it was nevertheless a component of his thinking.
He was enthralled by a superficial and superstitious naturalism.
Hitler was an "idealist". He was also a socialist, a vegetarian, a teatotaller, an antichristian who espoused a preverse, self-serving form of Christianity, a non-smoker, a drug abuser, a hypochondriac, childishly sentimental, a dilettante and a sexual deviant. If he were alive today and living in Wisconsin, he’d be on the liberal arts faculty of a third rate community college.