Recent evidence suggests that the "wobbles in the Earth's tilt were responsible for the global warming episodes that interspersed prehistoric ice ages."

By the Mayan calendar it's supposed to get colder

2012 Maya & Aztec Calendar: Milankovitch Cycles & Global Warming

http://www.associatedcontent.com/article/2478386/2012_maya_aztec_calen dar_milankovitch_pg2.html?cat=58