Truthdig: The cause of much of the recent extreme weather across the world is climate change triggered by human activities, scientists say.
The Earth has experienced a range of severe regional weather extremes in recent years, including the heat waves of 2011 in the US and 2010 in Russia, a year that also brought the unprecedented Pakistan floods.
Behind these distinct events, though, there is a common physical cause, according to a team at the Potsdam Institute for Climate Impact Research (PIK), Germany....