An agreement developed by and for industrial nations in 1997 at the United Nations Framework Convention on Climate Change (UNFCC) in Kyoto, Japan, to reduce their emissions of greenhouse gases by at least 5% below 1990 levels by 2012. The Kyoto Protocol was adopted in 2005 without the US ratifying it. Currently, the EU expects to achieve the goals two years early, in 2010.

Over 200 US cities have decided to meet the Kyoto Protocols on their own.