This document summarizes key environmental policies and debates in the United States from the 1970s to present. It discusses the establishment of the EPA in response to issues like smog and acid rain. It also describes varied state approaches to environmental problems and key federal policies like the Clean Air and Clean Water Acts. Additionally, it outlines policies around vehicle emissions, cap and trade systems, renewable energy, land use, green building codes and jobs. The conclusion notes ongoing public skepticism and the roles of states in responding to lack of federal action on climate change.