I am not a big believer that man is the major cause of global warming... and if he IS, that there is much that can be done..
BUT, some of the things that can be done will also HELP in air pollution which to me is a good thing...
Nuclear power should be required... I had read we get 16% of our power from nuclear.. make that 80% and think how much oil, gas and coal we can stop using!!!
Stop grandfathering in the old plants. Down here we have many old plants that spew out tons of air pollution and will not clean up because they are grandfathered.... make ALL plants come up to current levels in 5 years or close down....
Change to florescence (SP??) lights... I have them and they work great... if we all do it, again less electricity... we did our building where I work and the electricity bill dropped $100,000 a year...
Do some REAL car tailpipe emmission laws.... how many of us see the old clunker spewing out a cloud of thick smoke... I usually see one a day, or at least every other day.. don't just give tickets, confiscate the car if they don't get it fixed..
Make cars more fuel efficient... tax the hell out of SUVs EVERY YEAR... here in Texas, trucks and SUVs are more than 50% of the vehicles on the road...
So, where do you invest
Solar cells, wind farms, a company that plants trees for the carbon credits they can sell?? I don't think they will make enough money to offset you NOT buying Exxon or some other polluter...