this post was submitted on 18 Nov 2024
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When ice forms, it traps small airpockets in it, so we take samples of ice from the polar circles kilometres deep, date it, crush it to release the air pockets and measure the air contents. Then we can see how different the CO2 amounts were to now.
Source: there's a fuck ton of different articles that talk about this, and this is the first one I found of Google, search yourself for more.