Geology Question

The term “global warming” is front and center in the media. Everyone talks about it, but how many people know what it really means? What evidence is there to support global warming? What effects have we already seen, and what effects can we expect to see in the future? Discuss the issue of climate change and global warming? Research climate change/global on the internet (no Wikipedia). The following websites will a good starting point. Please sources used (no specific format required).

http://earthobservatory.nasa.gov/Features/GlobalWarming/

http://www.ncar.ucar.edu/research/climate/now.php