Public Labs is a franchise non profit (like Engineers without Borders or whatever) with a rather vague sounding name. They do environmental diy bio stuff that's actually pretty cool. They got their start mapping out the deepwater horizon spill and have chapters in a lot of cities. They could point you in the right direction of how to interface environmentalism and technology in a useful way.
Other people I would recommend reading about would be Natalie Jeremijenko (sp?) who did work on robot dogs that sniff out chemical pollutants, and Critical Art Ensemble, who did a lot of interesting and counter-ideological biotech public education projects.
I think it is tricky for many biotech people to get into environmentalism because there is a lot of sketchy ideology filling out stuff like ecology, like, why is animal life more important than microbial life, what is the "proper" ecosystem, etc. Not that there isn't anything there that is useful, it can just be difficult to do interesting technical work in what can often be an ethical sphere. The three groups above, of course, contradict my pessimism and pulled it off.
There is also a hacker space full of nice people in minneapolis too, the Hack Factory, I enjoyed my visit there. Good luck!