A overly obsessed nature fanatic who has lost all touch of reality and would kill their own family to save a flower. They like to stick animals and plants in jars and argue that they are 'helping to save the ecosystem' by harming small mammals with long metal polls.
Person A: "Did you hear about how the new strip mall they're building over where that barren lot of shrubs and dead grass is?"
Type-A Nature Freak: "OMG THAT MAKES ME SO P!SSED IMA GO RIOT AND BREAK THEIR BUILDINGS!"
Person A: "Woah, stop being such a Type-A Nature Freak."