(Web-based information sources) More sites on climate change and global warming The most authoritative source on climate change is the Intergovernmental Panel on Climate Change. All of its extensive reports can be accessed here:
Refer to the U.S. Environmental Protection Agency’s (EPA) site on climate change for basic information: http://www.epa.gov/climatechange/.
NASA also has excellent information on the topic at http://climate.nasa.gov/.
This 2013 article from The Economist provides a current survey of the climate change debate: http://www.economist.com/news/science-and-technology/21574461-climate-may-be-heating-up-less-response-greenhouse-gas-emissions.
There are a host of articles about the topic on this New Scientist site: http://www.newscientist.com/topic/climate-change.
The New York Times published a guide to global warming in November, 2013: http://topics.nytimes.com/top/news/science/topics/globalwarming/.