“Climate Change and the dinosaurs“. Anthony Watts has found a press release from Plymouth University. Geological evidence from Norway suggests that during the Cretaceous period, characterized by substantially higher CO2 levels than today, there were several abrupt temperature drops:
over a period of a few hundred or a few thousand years, ocean temperatures fell from an average of 13 degrees centigrade to between eight and four degrees.
Anthony’s implication is that this kind of ancient temperature change shows that there are potential natural drivers as strong as the theorized current man-made changes. So it mustn’t be our fault this time either.
Of course the study found evidence of sudden temperature drops, not rises.