• National debt counter (and another counter)

• Environmental Protection Agency

• Atmosphere calculator

• Report on Climate Change

• Periodic table of the elements

• environmentalchemistry.com

• The Nobel Prize for Ozone

• European greenhouse gas - Late breaking news
  (If you have trouble reading an article, you can gain access to Nature via the electronic journals section of the UCSB library here.)

• National Geophysical Data Center (NGDC)

• National Oceanic and Atmospheric Administration

• NIST Chemistry WebBook - NIST (National Institute of Standards and Technology) standard reference database. You can find a wide variety of information on the chemical and physical properties of many substances here. This is part of the Standard Reference Data Program.
  
  
• U.S. Geological Survey
  
  
• Facts about the Earth and about the Sun
  
  
• World Resources Institute
  
  
• Chemical and engineering news (If you have trouble with this link, try clicking here instead.)