The human race has broken another record on its race to ecological collapse. Congratulations humanity!

For the first time in human history — not recorded history, but since humans have existed on Earth — carbon dioxide in the atmosphere has topped 415 parts per million, reaching 415.26 parts per million, according to sensors at the Mauna Loa Observatory, a research outpost of the National Oceanic and Atmospheric Agency.

The macabre milestone was noted on Twitter by the climate reporter Eric Holthaus, based on the data recorded and presented by the Scripps Institution of Oceanography at the University of California, San Diego.


If the threshold seems unremarkable (it shouldn’t), it’s yet another indication of the unprecedented territory humanity is now charting as it blazes new trails toward environmental catastrophe.

Just last week a report revealed that at least 1 million species were at risk of extinction thanks to human activity and the carbon emissions that are a byproduct of economic development.

Read more: Tech Crunch