Sweeping changes could affect the United States' management of oceans, including offshore energy development.
Giant Panda 'Kai Kai' sits in his enclosure at the Giant Panda Forest exhibit at the River Safari, Nov. 28, 2012, in Singapore. Panda populations are threatened by poaching and a loss of habitat, as well as a low birth rate.
Each molecule remains in the atmosphere for about 100 years, meaning the gas can deplete the ozone layer as much others covered by the 1987 Montreal Protocol.
Melting ice caps are exposing more of the Arctic Ocean than ever before. The US moves to halt fishing in the newly ice-free zones even before a fishing industry blossoms there.
Recycling program turns an environmental hazard into electricity.