For more information on the topics discussed in the box, visit the following sites:
Population Growth
http://www.prb.org Population Reference Bureau
http://www.undp.org/popin United Nations Population Division
http://www.un.org/esa/populatin/unpop.htm United Nations Department of Economic and Social Affairs
http://www.unfpa.org United Nations Population Fund.
http://www.census.gov U.S. Bureau of the Census
Stratospheric Ozone
http://www.epa.gov/ozone EPA: Ozone
http://jwocky.gsfc.nasa.gov/ozone/ozone01.html NASA Goddard Space Flight Center: TOMS Ozone information
http://www.cpc.ncep.noaa.gov National Oceanographic and Atmospheric Administration (NOAA) Climate Prediction Center
http://www.atm.ch.cam.ac.uk/tour Ozone Hole tour
Global Warming and Severe Weather
http://www.jhu.edu/~climate Climate Change and Human Health Integrated Assessment Web
http://www.epa.gov/globalwarming EPA: Global Warming
http://www.epa.gov/ghginfo/index.htm EPA: Methane and Other Greenhouse Gases
http://www.enviroweb.org/edf Global Warming: Focus on the Future
http://www.ipcc.ch Intergovernmental Panel on Climate Change
http://www.giss.nasa.gov NASA Goddard Institute for Space Studies
http://www.noaa.gov/climate.html National Oceanic and Atmospheric Administration (NOAA): Climate
http://www.ngdc.noaa.gov/paleo/globalwarming/home.html National Oceanic and Atmospheric Administration (NOAA) Paleoclimatology Program: A Paleo Perspective on Global Warming
http://www.wmo.ch World Meteorological Organization (WMO)
Transportation and Energy
http://www.fueleconomy.gov Fuel Economy.Gov
http://www.eren.doe.gov U.S. Department of Energy: Energy Efficiency and Renewable Energy Network (EREN)
http://www.eia.doe.gov U.S. Department of Energy: Energy Information Administration
http://www.ott.doe.gov/hev U.S. Department of Energy Office of Transportation Technologies: Hybrid Electric Vehicle Program