The US Environmental Protection Agency has been criticized by environmentalists as being too business-friendly, but recent statements from the agency on climate change suggest it's warming up to environmentalist views. The US Climate Change Science Program, a government agency, also seems to feel to speak its mind.

Pew is also as balanced as you'll get on global warming, although at the end of the day they lean more left than right.

This Washington Post article gives a glance at some of the economics of emissions cuts.

Resources for the Future looks pretty balanced on the topic of climate change, bringing together environmentalists and industry to find common ground.

The International Panel on Climate Change is widely regarded as the be-all-and-end-all of global warming research

Union of Concerned Scientists

Report from the Arctic Council

NY Times also has a section devoted to global warming

The once sceptical Economist now advocates action against CO2 emmissions.

Heritage Foundation

Cooler Heads Coalition

The Cato Institute

The Copenhagen Consensus puts global warming at the bottom of the list of global problems that we should prioritize