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Where I live we have a few very accessible glaciers. People started to notice old tree stumps being exposed as the glaciers receded. What happened, according to scientists who commented about it, thousands of years ago the glacier receded and a forest grew, then the glaciers advanced and mowed over the forest, then the glacier receded and exposed the dead wood. They carbon dated the wood to between 3000 and 8000 years old because it had happened several times. I took this pic myself
tl;dr earth has been warming and cooling for a long time.
