Sources
https://en.wikipedia.org/wiki/Fossil_fuel
http://www.eesi.org/topics/fossil-fuels/description
http://www.sciencekids.co.nz/sciencefacts/chemistry/coal.html
https://www.iea.org/aboutus/faqs/coal/
https://en.wikipedia.org/wiki/Petroleum
http://www.ehow.com/list_6117874_economic-impacts-fossil-fuels.html
https://en.wikipedia.org/wiki/Global_warming
http://news.bbc.co.uk/2/shared/spl/hi/sci_nat/04/climate_change/html/greenhouse.stm
https://www3.epa.gov/climatechange/impacts/health.html
http://www.altenergy.org/
http://environment.nationalgeographic.com/environment/global-warming/wind-power-profile/
http://www.eesi.org/topics/fossil-fuels/description
http://www.sciencekids.co.nz/sciencefacts/chemistry/coal.html
https://www.iea.org/aboutus/faqs/coal/
https://en.wikipedia.org/wiki/Petroleum
http://www.ehow.com/list_6117874_economic-impacts-fossil-fuels.html
https://en.wikipedia.org/wiki/Global_warming
http://news.bbc.co.uk/2/shared/spl/hi/sci_nat/04/climate_change/html/greenhouse.stm
https://www3.epa.gov/climatechange/impacts/health.html
http://www.altenergy.org/
http://environment.nationalgeographic.com/environment/global-warming/wind-power-profile/