ice cores from antarctica go back 650,000 years and neither temp nor CO2 have ever
been this high in all that time. so "natural" global warming would have to be on a
cycle longer than 650K years.




Over the last 29 years direct, not proxy, measurement of the
Sun's output has shown no long term growth large enough to
explain the warming of the Earth, only an 11-year cycle
is noticed:


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