This is the best tl;dr I could make, original reduced by 55%. (I'm a bot)
> The amount of carbon dioxide in the Earth's atmosphere is approaching a level not seen in 15m years and perhaps never previously experienced by a hominoid, according to the authors of a study.
> At pre-lockdown rates of increase, within five years atmospheric CO2 will pass 427 parts per million, which was the probable peak of the mid-Pliocene warming period 3.3m years ago, when temperatures were 3C to 4C hotter and sea levels were 20 metres higher than today.
> It seems we must now go much further back to see what's ahead. Some time around 2025, the Earth is likely to have CO2 conditions not experienced since the Middle Miocene Climatic Optimum 15m years ago, around the time our ancestors are thought to have diverged from orangutans and become recognisably hominoid.
> For the paper published in the journal Nature Scientific Reports, a team of researchers from the University of Southampton constructed a new high-resolution record of atmospheric CO2 during the Pliocene using data derived from the boron levels in tiny fossils about the size of a pin head collected from deep ocean sediments of the Caribbean Sea.
> This confirmed trends previously observed in ice cores, but also allowed a more precise estimate of the CO2 range in that geological epoch, when levels of solar radiation were the same as today.
> "Currently, our CO2 levels are rising at about 2.5 ppm per year, meaning that by 2025 we will have exceeded anything seen in the last 3.3 million years."
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