The amount of carbon dioxide in the atmosphere just hit its highest level in 800,000 years, and scientists predict deadly consequences

by Kevin Loria

We have a pretty good idea of what Earth’s atmosphere has looked like for the past 800,000 years.
Humans like us – Homo sapiens – evolved about 200,000 years ago, but ice-core records reveal intricate details of our planet’s history from long before humans existed. By drilling more than 3 kilometers deep into the ice sheets over Greenland and Antarctica, scientists can see how temperature and atmospheric carbon-dioxide levels have changed.

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