
For more information on topics discussed in Lesson 4, see these selected references:
- http://cdiac.esd.ornl.gov/trends/emis/em_cont.htm(link is external)
- http://www.epa.gov/globalwarming/emissions/index.html(link is external)
- http://www.grida.no/climate/vital/intro.htm(link is external)
- http://www.epa.gov/ozone/science/(link is external)
- http://www.epa.gov/globalwarming/climate/index.html(link is external)
- http://yosemite.epa.gov/oar/globalwarming.nsf/content/ActionsIndividual.html(link is external)
- http://www.giss.nasa.gov/edu/gwdebate/(link is external)
- http://www.epa.gov/air/acidrain/(link is external)
- http://pubs.usgs.gov/gip/acidrain/contents.html(link is external)
- http://www.epa.gov/air/visibility/(link is external)
- http://www.epa.gov/air/urbanair/6poll.html(link is external)
- http://www.epa.gov/air/urbanair/co/what1.html(link is external)