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 3,000,000 years ago.
Carbon dioxide levels have jumped about 100 ppm since 1958, when the American scientist Charles David Keeling first started recording daily atmospheric measurements using instruments at the Mauna Loa Observatory in Hawaii. To put that in perspective, a similar increase took 10,000 years, from the coldest part of the last ice age to its end, according to an unpublished working paper by Siegert and his colleagues at the Grantham Institute.
The cycle is an intricate symphony in which the planet tries to regulate its temperature by naturally storing and exchanging carbon among the atmosphere, land, oceans, rocks and living organisms. But human-induced changes, such as burning fossil fuels or mass deforestation, can overwhelm the natural carbon cycle and outpace the planet's ability to offset elevated greenhouse gases."The rate of rise in the last decade has been faster than previous decades,” he said."We're just tracking ever onwards, and 400 ppm is now a distant memory.”
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