Just thinking... ice cores are like the Earth's old diaries, bhai. They trap tiny bubbles of ancient air in each layer of snow that fell, so we can measure past CO2 directly. For 800,000 years, we drill deep in Antarctica, reading these layers like tree rings. But the obvious answer is that it's a perfect record—my life in the lab says the hardest part isn't the measurement, but keeping our own breath from contaminating a core that's a million years old. We must work in -20°C, holding our breath in moments, for a truth that old. You understand the care it takes?
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