The 2009 Copenhagen Conference will take place December 7-18 in the Bella Conference Center just a few miles from the Copenhagen airport. Emissaries from 170 nations are expected, with several other smaller countries sending representatives. More than 8,000 people are expected to attend, including members of the press. The Copenhagen Conference is being held to establish new plans to deal with issues of global warming and ways to reduce carbon dioxide and other environmentally harmful emissions. Most of the discussions leading up to the Copenhagen Conference focus on methods for reducing greenhouse gas emissions through a "cap and trade" approach. Cap and trade is an administrative approach where some type of central authority (usually a government or an international body) sets a limit, or cap, on the amount of a pollutant that can be emitted by nations or corporations. In this article, the author presents a list of recommended sites, including some that primarily describe the cap and trade system. Some sites include lesson plans and resources for classroom teachers. The author strongly encourages educators to find ways to bring this topic into the classroom so that students are able to understand the impending hoopla about the energy bill and U.S. participation at the Copenhagen Conference. (Contains 2 notes.)