The Earth has been getting warmer — but how much of that heat is due to greenhouse gas emissions and how much is due to natural causes?

A leaked report by a United Nations’ group dedicated to climate studies says that heat from the sun may play a larger role than previously thought.

“[Results] do suggest the possibility of a much larger impact of solar variations on the stratosphere than previously thought, and some studies have suggested that this may lead to   (Read more: http://www.foxnews.com/science/2013/02/01/report-show-un-admitting-solar-activity-may-play-significant-role-in-global/#ixzz2Ju0riFME)