Hurdles to Combating Global Warming

I am organizing a Russian Hill global warming group through some postings on Craigslist. Our first meeting is tonight.

I am sitting in Starbucks trying to do my homework to answer some questions and get some ideas ahead of the meeting. Some questions are:
– What are the man-made causes of global warming?
We know the general list. Cars, trucks, airplanes, most power plants, deforestation. But in order to do something about the problem, we need numbers. We need to know where our efforts will have the most effect. A quick Google search turned up one promising link. Unfortunately it was several years old and the percentages added up to over 100%

– Where does my electricity come from?
This turned up even less results (0) than the first question. I have no idea where my electricty comes from. A Google search implies that very few people in the country will be able to answer this question easily. PG&E does have some information. It says that 58% of their energy comes from non or low-emitting sources. This implies that 42% comes from heavy emitting sources, but it doesn’t say explicitly.
Update: Obviously, I was researching this while I was writing. Thanks to Wikipedia, I have a pretty good breakdown.

– Where does my food come from?
This one will take a bit more research, and I couldn’t expect it to be answered by a simple Google search.

– What can I do to combat global warming?
Most or all websites that you go to talk only of individual action. For real change in habits to take place, we need political action as well.

Hopefully the group can put our minds together and come up with some answers and solutions.