| http://207.198.146.139/masters2000/jermi/co2graph.htm
(c) |
| http://www.uscar.org/(c) |
| http://www.fueleconomy.gov/(h&c) |
| http://www.eren.doe.gov/(c) |
| http://www.afdc.doe.gov/(ch&b) |
| http://www.eia.doe.gov/(h) |
| http://www.pbs.org/wgbh/warming/(h&ch) |
| http://www.ozone.org/(c,ch,m) |
| http://www.arm.gov/docs/education/background(c) |
| http://www.epa.gov/globalwarming(h,ch,b,c) |
| http://sedac.ciesin.org/ozone/docs/UNEPsummary96.html(ch&b) |
| http://www.ciesin.org/TG/OZ/cfcozn.html(b&ch) |
| http://www.al.noaa.gov/WWWHD/pubdocs/StratO3.html(ch,h,c,b) |
| http://www.arm.gov/docs/education(ch&h) |
| Microsoft(R) Encarta(R) 98 Encyclopedia.
(c) 1993-1997 Microsoft Corporation.(ch) |
