It took no time for countries under quarantine to see energy use plummet, and with it, pollution levels. But even as citizens of Los Angeles and Jalandhar exuberantly posted photos of the Hollywood sign and the Himalayas visible without smog for the first time in decades, climate scientists warned the dramatic drop in emissions would do little if anything to slow the pace of global warming.
New measurements of atmospheric carbon dioxide released today from the Scripps Institution of Oceanography at the University of California, San Diego confirm that. prediction As expected, CO levels reached a new record in May: ₂ 417.2 parts per million gas molecules in the atmosphere, continuing a trend that’s gone unbroken for six decades. That’s 2.4 ppm above the reading for May 2019, which matches the average annual increase for 2010-2019. The U.S. National Oceanic and Atmospheric
Administration registered a similar 417.1 ppm.
The concentration of carbon dioxide in the atmosphere isn’t a direct measure of
industrial emissions. What’s left in the air is slightly less than half of total emissions, with the rest drawn down by plants on land and the ocean itself.
Before the industrial age, atmospheric CO stood at 280 ppm. Geological evidence ₂ suggests concentrations haven’t been as high as they are today in at least 3 million years. Nothing has vaporized carbon at this rate—or even a tenth of this rate—since a meteor ended the dinosaurs’ reign 66 million years ago. The vast amounts of CO are ₂turning the oceans acidic more quickly than at any point going back an estimated 300
The Global Carbon Project, an international research collaboration, estimated last month that CO emissions may fall 4% in 2020 ₂ if Covid-19 restrictions are lifted this summer, or as much as 7% if they persist through year-end.
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