There are issues both with your so called, "enviro-nazis" and their opponents who will go out of their way to bash anything might be good for people in general just because it happens to be in line with the agendas of environmentalists. I think it's illogical and goes against reason to support shitting where you eat just to spite an environmentalist who points out that it's not a good idea to shit where you eat.
You say that 'humans are the most important thing in the world." One of the things that make people humans is the ability to reason. Abandoning reason for an emotional agenda regardless of whether it's pro-environmentalist or anti-environmentalist is the path toward losing our humanity and becoming no better than animals.