<URL:http://www-eosdis.ornl.gov>
  The Oak Ridge National Laboratory (ORNL) Distributed Active Archive 
Center (DAAC) provides information about the Earth's biogeochemical dynamics (the chemical interactions among the Earth's surface, water, and air that produce changes in the Earth and its climate) to the global change research community, policy makers, educators, and the general interested public.

<URL:http://cdiac.esd.ornl.gov:80/cdiac/>
  The Carbon Dioxide Information Analysis Center (CDIAC) at ORNL provides information to help international researchers, policymakers, and educators evaluate complex environmental issues, including potential climate change associated with elevated levels of atmospheric carbon dioxide and other radiatively active trace gases.

<URL:http://eosweb.larc.nasa.gov>
<URL:telnet://eosdis.larc.nasa.gov> (login "ims", password "larcims")
  The Langley Distributed Active Archive Center (DAAC) archives and
distributes radiation budget, cloud, aerosol, and tropospheric chemistry data to the general science community.  Data are available via FTP, tape and CD-ROM.  
  Products include data from the Earth Radiation Budget Experiment (ERBE), Surface Radiation Budget (SRB), International Satellite Cloud Climatology Project (ISCCP), Stratospheric Aerosol and Gas Experiment (SAGE), First ISCCP Regional Experiment (FIRE), and Global Tropospheric Experiment (GTE).

<URL:http://www.epa.gov>
<URL:gopher://gopher.epa.gov>
  Environmental Protection Agency.  A variety of publicly-accessible
databases, including air pollution data, toxic chemical release data,
and geographic data.