Carbon dioxide levels hit highest mark in human history, despite coronavirus

The coronavirus pandemic’s economic downturn may have set off a sudden plunge in global greenhouse gas emissions, but another crucial metric for determining the severity of global warming — the amount of greenhouse gases actually in the air — just hit a record high. According to readings from the Scripps Institution of Oceanography and the National Oceanic and Atmospheric Administration (NOAA), the amount of CO2 in the air in May 2020 hit an average of slightly greater than 417 parts per million (ppm). This is the highest monthly average value ever recorded, and is up from 414.7 ppm in May of last year.

Carbon dioxide levels are the highest they’ve been in human history, and probably are the highest in 3 million years. The last time there was this much CO2 in the atmosphere, global average surface temperatures were significantly warmer than they are today, and sea levels were 50 to 80 feet higher.

The continuing rise in CO2 concentrations in the atmosphere may sound surprising in light of recent findings that the pandemic, and the associated lockdowns, had led to a steep drop in global greenhouse gas emissions, peaking at a 17 percent decline in early April.

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