A new study finds humans were virtually the main cause of global warming since 1950, using an alternative statistical model. (Mario Tama/Getty Images) A new study says climate change is virtually all of our fault. Scientists utilizing new statistical methods have calculated that most of the observed warming of the planet between 1951 to 2010 was attributable to "anthropogenic forcings" — i.e. manmade greenhouse gaseswith a "very limited contribution from natural forcings." The report entitled, "A new statistical approach to...