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I think the problem here si that while sunspots come and go CO2 is "forever".
If we say "It's OK to generate lots of CO2 - the changes in climate are due to sunspot activity" then what happens when the sunspot activity is such that the world warms and the CO2 warms it too?
One number is bigger than the other. But it doesn't answer the question, does it?
Frethack:say we are not entering a maunder minimum. But what if we were to continue with low or lower than average activity for the next cycle or two? This would not be the worst case scenario, but would it be bad? Would it make more of an impact on the climate than Co2 levels?
Quote from: SkepticSam on 18/09/2009 08:05:50One number is bigger than the other. But it doesn't answer the question, does it?Actually that's the symbol for "is much bigger"
Thats kind of a loaded question. It depends on how low solar activity goes and for how long. During the 1970's, solar cycle 20 was comparatively small cycle (when compared to the 20th century average), and there was a decline in global temperatures, though historically it was not much of a decline. The same with the very deep solar minimum around 1913 (between cycles 14 and 15). The year without a summer occurred during the Dalton Minimum, a very short minima (15 years I think), but was also aided by the eruption of Mt Tambora. In short...its a very difficult question to answer with any degree of certainty until more is understood about the physical mechanisms that link solar activity and climate. I have my own hypothesis, and am gathering data and resources, but until there is a large body of evidence to show an actual physical mechanism within the climate system, it is just that...a hypothesis.
BoredI don't have my referces redily at hand, but my recolection is the Jurasic had about 3000ppm and was about 20 degrees (FC?) warmer. CO2 has subsequently declined and has been less then 300ppm for a very long time.In addition, I had a whole host of proxy matterial that showed Roman times as much as 6 degrees warmer. Then the climate started to cool, then got warmer then today dring The Midieval era, followed by the Little Ice age which only ended in the middle of the 1800's. One of the biggest mistakes the climatistas ever made was to invent the "Hocky" stick graph. Anyone who believes the climate was flat for the last 2,000 years then started to warm suddenly during the industrial era has placed themselves flat in the flat earth society. Hocky sticks and forlorn Polar Bears.