FRONTLINE and the Center for Investigative Reporting go behind the scenes to explore how bi-partisan political and economic forces prevented the U.S. government from confronting what may be one of the most serious problems facing humanity today. The film examines some of the key moments that have shaped the politics of global warming, and how local and state governments and the private sector are now taking bold steps in the absence of federal leadership. [Explore more stories on the original website for Hot Politics.]