http://www.skepticalscience.com/empirical-evidence-for-globa...
http://en.wikipedia.org/wiki/Scientific_opinion_on_climate_c...
http://climate.nasa.gov/evidence/
http://www.skepticalscience.com/empirical-evidence-for-globa...
http://en.wikipedia.org/wiki/Scientific_opinion_on_climate_c...
http://climate.nasa.gov/evidence/