Former Microsoft software developer Charles Simonyi flies during a parabolic flight aboard a zero-gravity simulator, a Russian IL-76 MDK aircraft used for astronauts' training flights in weightlessness, in Star City outside Moscow, on Feb. 26, 2007. As the world's fifth space tourist, Simonyi blasted off to the International Space Station on April 7, 2007.
Many caribou herds have lost more than half their number from the maximums of recent decades.
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.