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About: Solar activity and climate     Goto   Sponge   NotDistinct   Permalink

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Patterns of solar irradiance and solar variation have been a main driver of climate change over the millions to billions of years of the geologic time scale, but their role in recent warming is insignificant. Evidence that this is the case comes from analysis on many timescales and from many sources, including: direct observations; composites from baskets of different proxy observations; and numerical climate models. On millennial timescales, paleoclimate indicators have been compared to cosmogenic isotope abundances as the latter are a proxy for solar activity. These have also been used on century times scales but, in addition, instrumental data are increasingly available (mainly telescopic observations of sunspots and thermometer measurements of air temperature) and show that, for exampl