• Climate Progress: http://climateprogress.org/
• Daily Grist:  http://www.grist.org/
• Dot Earth: http://dotearth.blogs.nytimes.com/
• RealClimate; http://www.realclimate.org/
• Real-Economics: http://real-economics.blogspot.com/
• Skeptical Science; http://www.skepticalscience.com/