For the first time in human history, the concentration of carbon dioxide in the Earth's air reached 400 parts per million. The last time the planet experienced such high levels was more than 3M years ago.
. During that geologic period, which lasted from about 5.3 million to 2.6 million years ago, humans had yet to appear on the planet, and average sea levels were up to 65 feet higher than they are today. Global average temperatures were also around 7 degrees Fahrenheit warmer, with temperatures at the poles likely double that, according to Siegert.
"We've done in a little more than 50 years what the Earth naturally took 10,000 years to do,” he said., named for Keeling, who died in 2005. The iconic graph shows that carbon dioxide levels are increasing not only over time but also at a faster and faster pace in recent years. The sharp uptick, triggered by human-caused climate change, is apparent from the graph's steep incline, which was already apparent by the 1960s.
"In the spring and summer, as vegetation greens, this helps draw down carbon dioxide from the atmosphere,” Betts said."In the fall and winter, carbon dioxide is released back into the atmosphere when plants die and trees shed leaves.” Ralph Keeling, a professor of geochemistry at the Scripps Institution of Oceanography — and the son of Charles David Keeling — said the only way to halt the trajectory of the Keeling Curve is to significantly cut fossil fuel emissions.
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