If I can recall my library rat days, I did learn that there were some tendencies of core Nazi ideology towards elements of ecology in the name of representing racial purity and "cleanliness", even as Nazism still relied on increased dirty production and heavy industrialism of their time.
Not so sure RFK2 would qualify with that today; he seems to me to be more of a classical antivaxx/homeopathic crank leaning on right-wing backlash against Big Guviment.