Why on Earth should anthropogenic global warming explain past temperature fluctuations? That is the most ridiculous piece of crap I've read today.
There are many ways to perturb the climate, for those out there so convinced that they have stumbled onto something clever...it's radiative physics, it's not new, and it explains much of Earth's climate history. Albedo, insolation, greenhouse effects, solar irradience changes, carbon cycle feedbacks, dynamic ice sheets, oceanic annular modes, etc. etc.... they all produce a radiative effect on the atmosphere.
Glaciations are for the large part, induced by orbital changes, and then compounded by feedbacks. It's called Milankovitch cycles. And they look like this:
For reading, click any one of these scholarly articles (pdf's):
http://www.ldeo.columbia.edu/users/polsen/cpcp/olsenandkent.1999a.pdf
http://leonardo.met.tamu.edu/people/faculty/north/pdf/(56)ShortCycles.pdf
http://marineecology.wcp.muohio.edu...glacial_cycles/web/pdf/MilankovitchCycles.pdf
http://www.geographie.unibe.ch/leny...ionen/articles/kull_1998_climate_dynamics.pdf
There are many ways to perturb the climate, for those out there so convinced that they have stumbled onto something clever...it's radiative physics, it's not new, and it explains much of Earth's climate history. Albedo, insolation, greenhouse effects, solar irradience changes, carbon cycle feedbacks, dynamic ice sheets, oceanic annular modes, etc. etc.... they all produce a radiative effect on the atmosphere.
Glaciations are for the large part, induced by orbital changes, and then compounded by feedbacks. It's called Milankovitch cycles. And they look like this:
For reading, click any one of these scholarly articles (pdf's):
http://www.ldeo.columbia.edu/users/polsen/cpcp/olsenandkent.1999a.pdf
http://leonardo.met.tamu.edu/people/faculty/north/pdf/(56)ShortCycles.pdf
http://marineecology.wcp.muohio.edu...glacial_cycles/web/pdf/MilankovitchCycles.pdf
http://www.geographie.unibe.ch/leny...ionen/articles/kull_1998_climate_dynamics.pdf