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actually we do have some excellent weather records going back thousands even millions of years, tree rings (dendrochronology), ice-cores from polar and antarctic ice contain "datable" ancient air and sea cores contain ancient foramnifera (not sure I spelled that right) which are minute sea creatures that record environmentally sensitive isotopes of various molecules such as oxygen... one thing that's becoming clearer is that environmental fluctutaion in the past has not been
unfortunately, like all records it's all in the interpretation...
cheers,
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