Hook

Their other posts in the index, biggest breakout first.
Scientists dug a hole to the bottom of Antarctica and they pulled up this ice core and it shows our atmosphere from 800,000 years ago. They dug it up right here where it's so cold that the ice just piles up and up and up trapping bits of history inside creating layers like this that can be counted like tree rings. But what's most interesting is each of these layers is full of bubbles that hold all sorts of gases from that period's atmosphere. So every layer is like a time capsule and once a core is pulled up researchers carefully slice it and then crush or melt it in vacuum to prevent contamination. And this releases those ancient gas bubbles so they can analyze them, which is how they made this chart showing how levels of CO2 in our atmosphere have changed over time. And then in 2025, they pulled up one that goes even farther 1.2 million years to see that follow along.