[QUOTE] Not just sun spots causing cooling. The whole system is cyclic and is balanced by a number of feedback scenarios, in particular the effect of CO2 as a driver of climate change. The sunspots are a pretty short-term blip compared to the predominant orbital cycles of eccentricity , obliquity and precession (Milankovich cycles) that are believed to be responsible for the episodic nature of glaciations (and interglacials) throughout the last 2.7 Ma. [/QUOTE] Have you come across the work of Theodor Landscheit? Some interesting stuff on prediction of sunspot activity levels. [URL]http://www.john-daly.com/solar/solar.htm[/URL] Also: [URL]http://mitosyfraudes.8k.com/Calen/Landscheidt-1.html[/URL] [URL]http://www.john-daly.com/theodor/co2new.htm[/URL] Another thing which needs explaining to me by the proponents of MMGW is why the ice core samples show that increases in CO2 historically lag behind rises in temperature by 800 years. Increasing temperature causes a rise in CO2 rather than the opposite.