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That means that in the entire history of human civilization, CO2 levels have never been this high.
Other research, though, shows that you have to go back much farther in time, well beyond 800,000 years ago, to find an instance where CO2 was sustained at 400 ppm or greater.
As we near the record for the highest CO2 concentration in human history — 400 parts per million — climate scientists worry about where we were then, and where we're rapidly headed now.
According to data gathered at the Mauna Loa Observatory in Hawaii, the 400 ppm mark may briefly be exceeded this month, when CO2 typically hits a seasonal peak in the Northern Hemisphere, although it is more likely to take a couple more years until it stays above that threshold, according to Ralph Keeling, a researcher at the Scripps Institute of Oceanography.
The most direct evidence comes from tiny bubbles of ancient air trapped in the vast ice sheets of Antarctica.
Megatoothed sharks prowled the oceans, the world's seas were up to 100 feet higher than they are today, and the global average surface temperature was up to 11°F warmer than it is now.
In the mid-2010s, grime began to receive popular attention in North America.
The genre has been described as the "most significant musical development within the UK for decades." Deja Vu FM, Major Fm, Freeze 92.7 and Raw Mission.
While there have been past periods in Earth's history when temperatures were warmer than they are now, the rate of change that is currently taking place is faster than most of the climate shifts that have occurred in the past, and therefore it will likely be more difficult to adapt to.
, a possible ancestor of modern homo sapiens, and when herds of giant, elephant-like Mastadons roamed North America.