Climate Science

IPCC - Intergovernmental Panel on Climate Change 

RealClimate - Climate science from climate scientists

National Center for Atmospheric Research (NCAR)

Hadley Climate Center 

Pew Center on Global Climate Change

Climate Policy

United Nations Framework Convention on Climate Change

Cities for Climate Change - International Council for Local Environmental Initiatives, Cities for Climate Change

US EPA climate change

ClimatePolicy - ClimatePolicy is a commentary that explores aspects of climate change that relate to our policy choices. Policy choices will likely serve the interests of society most effectively if they are grounded in the best available knowledge and understanding. 

Union of Concerned Scientists on Climate Change

Educational

Frontline and NOVA - What's Up With the Weather, Frontline and NOVA

lightblueline is a public information project to paint on the streets the message that human induced climate change will impact coastal cities

Nation Center for Atmospheric Research (NCAR)