on North America seems poised at last to take its first major regulatory steps toward reducing its greenhouse gas emissions. The United States Congress is currently considering a number of legislative actions to address the concern of global climate change and a growing urgency to regulate greenhouse gas emissions. Principal among these options is America’s Climate Security Act of 2007, also known as the Lieberman-Warner Bill,1 which has been voted out of subcommittee but was recently shelved and is unlikely to receive full consideration