mercredi 8 août 2012

Global Warming Causes Heat Waves, Says NASA Scientist


Global Warming Causes Heat Waves, Says NASA Scientist

Heat wave events, once rare, are becoming more frequent due to global warming, says NASA scientist James Hansen. Such summertime heat events covered only 1% of Earth's surface for most of the time since humanity has been studying the climate. Now, when they occur, they cover closer to 10% of the global land area.