I read a few articles about the proposed cap-and-trade system in the U.S. and thought it'd be a good opportunity to read up on the Kyoto Protocol. According to a press release from the United Nations Environment Programme (from Wikipedia): The Kyoto Protocol is an agreement under which industrialized countries will reduce their collective emissions of greenhouse gases by 5.2% compared to the year 1990 (but note that, compared to the emissions levels that would be expected by 2010 without the Protocol, this limitation represents a 29% cut). The goal is to lower overall emissions of six greenhouse gases - carbon dioxide , methane , nitrous oxide , sulfur hexafluoride , hydrofluorocarbons , and perfluorocarbons - averaged over the period of 2008-2012. National limitations range from 8% reductions for the European Union and some others to 7% for the US, 6% for Japan, 0% for Russia, and permitted increases of 8% for Australia and 10% for Iceland. An additional summary from Wikipedia o...