Say "climate change" or "global warming" and you can start a debate most anywhere these days. Even if everybody present agrees things are changing or getting hotter, you'll find a dearth of agreement on what to expect.
A summary of some of the issues, and key terms like "projection," "prediction" and "tipping point" can be found right now on realclimate.
That blog and I point to a piece in this week's Economist. The big money guys really see green on this one. But we've already blogged on that one: trouble=profit. Just reflect on how much money big pharma makes on human illness and misery. Now we're talkin' sicko planet.