re: 'Global Warming Is Lies' Claims Documentary
CO2 (carbon dioxide) isn't the only greenhouse gas that human are adding to the atmosphere, although it is the most abundant. CO2 equivalent represents the amount of CO2 that would have the same impact on the "radiative forcing" of the atmosphere (i.e. amount of heat absorbed by the greenhouse gases in question) as the combination of gases that we're talking about. For fuller explanations of this and other technical issues you can look on www.realclimate.org, where you can find comprehensive discussions of all the aspects of climate change science that usually cause controversy or confusion.