http://www.sustainablebabysteps.com/human-impact-on-environment.html
http://blogs.howstuffworks.com/2009/05/22/how-does-acid-rain-affect-the-environment/
http://wiki.answers.com/Q/How_does_acid_rain_damage_the_environment
http://www.epa.gov/acidrain/education/site_students/whatcauses.html
http://www.umac.org/ocp/HowisAcidRainFormed/info.html
http://geography.about.com/od/globalproblemsandissues/a/acidrain.htm
http://acidrainissues.zoomshare.com/
http://geography.about.com/od/globalproblemsandissues/a/acidrain.htm
http://www.umac.org/ocp/EnvironmentalEffectsofAcidRain/info.html
http://www.epa.sa.gov.au/xstd_files/Air/Information%20sheet/info_acidrain.pdf
http://www.epa.gov/acidrain/education/site_students/beingdone.html
http://www.epa.gov/acidrain/reducing/index.html
http://library.thinkquest.org/CR0215471/acid_rain.htm
http://wiki.answers.com/Q/What_will_happen_if_we_don't_stop_acid_rain
http://greenliving.nationalgeographic.com/pollution-affect-living-things-including-humans-2193.html
http://www.mass.gov/dep/air/aq/env_effects.htm
http://www.buzzle.com/articles/causes-of-air-pollution.html
http://www.windows2universe.org/earth/Atmosphere/pollution_sources.html
http://www.mpm.edu/collections/pubs/botany/moss/
http://science.time.com/2011/09/27/the-10-most-air-polluted-cities-in-the-world/
http://www.who.int/bulletin/archives/78(9)1078.pdf
http://www.air-n-water.com/air-pollution.htm
http://www.windows2universe.org/earth/climate/cli_effects.html
http://www.globalchange.gov/publications/reports/scientific-assessments/us-impacts/full-report/global-climate-change
http://www.lenntech.com/greenhouse-effect/global-warming-history.htm
http://www.greenpeace.org/usa/en/campaigns/global-warming-and-energy/
http://www.articlesbase.com/news-and-society-articles/what-will-happen-if-global-warming-continues-1478307.html
http://library.thinkquest.org/26026/Environmental_Problems/ozone_depletion_-_effects.html
http://library.thinkquest.org/26026/Environmental_Problems/ozone_depletion.html
http://library.thinkquest.org/26026/Environmental_Problems/ozone_depletion.html
http://en.wikipedia.org/wiki/Ozone_depletion
http://environment.about.com/od/smogfaq/f/smog_faq_three.htm
http://www.deq.louisiana.gov/portal/Default.aspx?tabid=1991
http://en.wikipedia.org/wiki/Smog
http://en.wikipedia.org/wiki/Smog
http://library.thinkquest.org/26026/Environmental_Problems/smog.html
The effects:
"Every living thing has an impact on its environment. Therefore a human impact on the environment is inevitable. By simply existing, all species - including ourselves - will imprint their mark on the world around them.
What differentiates us from other species is our ability to greatly overburden our environment with very few limits."