This program presented by Sir David Attenborough discusses the thickening of Earth’s carbon dioxide envelope and, using climate modeling, confirms that fossil fuels are primarily responsible for a global rise in temperatures going far beyond any normal allowance for cyclical fluctuation. Traveling from the Arctic, where the ecosystem is collapsing; to the low-lying islands of the South Pacific, where flooding is now chronic; to Katrina-ravaged Louisiana; to the failing Amazon rainforests; to the bleaching Great Barrier Reef, the program offers definitive evidence of global warming: retreating glaciers, rising seas, stronger hurricanes, severer droughts, encroaching deserts, and a biosphere that is visibly in decline. Produced by the Open University. (60 minutes)