Well...

Are there any people who are actively working on fixing the environment? It seems like if we don't do anything then in ten or twenty years (my lifetime!) there will be a "crunch" where something truly horrific may happen. In one sense, fixing the environment is the only issue we have because if we don't fix it then nothing else will matter in the face of how horrible the consequences will be.

How are you fixing it? What technologies are you using? How did you get into this? I'd like to know everything and anything people on HN are doing that's geeky to solve this thing.