Again, this is the wrong time in global cycle for the earth to be warming. It is supposed to be cooling right now.
For the skeptics, from Yale:
http://yaleglobal.yale.edu/display.article?id=10679
A good collection of the official data from Columbia:
http://www.columbia.edu/~jeh1/
It's not just about the sea rising, there has been a rise in extreme climate based events(the cat 5 hurricanes, anyone). Other consequences of the climate change are mass extinction and mass crop failure. Really, migration isn't that much of a problem besides the devastation to many economic infrastructures. Manhattan, for example, would not be livable. Contrary to popular opinion, the earth will not compensate for us-it's very sensitive in the long term to these things, which will knock us out of equilibrium. Maybe it doesn't matter much on a long term timescale, but that is sort of a nihilistic point of view that should be a moot point.
I don't know, I really don't like a lot of environmental groups. They've associated these things with a lifestyle, being trendy and extremist. I think it's easier for a lot of people to believe that it is media hype, especially after all of the things the media has hyped-and in some cases, it is, yet they leave important cases and facts alone. They just aren't dependable for scientific accuracy. I just don't go to regular news sources for scientific information anymore.
Btw, for those who like skepticism, check out the skeptical inquirer.
I do think that the way to go would be to strike a balance between naturalism and profit, and that it can be done. I'm also not ready to give myself over to pessimism yet.