According to USA Today, carbon dioxide levels spilled over the 415 parts per million mark on Friday, the highest ever experienced in the history of humanity.
“We don’t know a planet like this,” said meteorologist Eric Holthaus on Twitter. "This is the first time in human history our planet's atmosphere has had more than 415ppm CO2," he tweeted. "Not just in recorded history, not just since the invention of agriculture 10,000 years ago. Since before modern humans existed millions of years ago."
The Hawaii Mauna Loa Observatory collected the CO2 data that yielded the 415 PPM result. In the 800,000 years prior to the Industrial Revolution, levels of CO2 never passed the 300 PPM mark.
Researchers earlier this year used paleoclimatic data and computer simulations to estimate the levels of CO2 in Earth’s atmosphere from the past 3 million years, none of which were higher than they are today.
The director of the Scripps Institute of Oceanography at the University of California, San Diego program responsible for CO2 concentration monitoring, Ralph Keeling, said that "the average growth rate is remaining on the high end. The increase from last year will probably be around three parts per million whereas the recent average has been 2.5 ppm."