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Cake day: November 22nd, 2023

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  • Sure. We’ve taken ice cores out of glaciers that are super long. Basically there’s an isotope of Oxygen that strongly correlates to air temperatures that we can measure at different levels of the core. We know roughly how much ice gets deposited onto the glacier every year so we can extrapolate how long ago each layer was deposited and then measure that isotope to get an estimate of how warm it was that winter going back a few thousand years. Taking that data and combining it with modern temperature readings we can see a sharp uptick around the late 19th century where increased human greenhouse gas output begins.