Report Offensive Message

Hmm... Interesting read. Thanks. However the article is simply talking about what I brought up in my first response to Don, the axial tilt or obliquity which has a ~41,000 year cycle. There are other orbital parameters that also have an effect on climate and the full theory is referred to as Milankovitch Cycles.

http://en.wikipedia.org/wiki/Milankovitch_cycles

None of those acts on a short enough time scale to have a significant effect over just a couple of centuries and if you look at the forcings from all of the components of Milankovitch Cycles together the net effect is a slight cooling bias at the moment.