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LATEST NEWS UPDATES | Flattening the climate curve -R Sukumar

Flattening the climate curve -R Sukumar

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published Published on Jun 10, 2020   modified Modified on Jun 10, 2020

-The Hindu

Leaders should act on the climate crisis with the same alacrity they have shown towards COVID-19

Two interrelated curves began their upward trend two centuries ago with the advent of the industrial age. The first curve was the atmospheric concentration of carbon dioxide (or, more generally, all greenhouse gases, GHGs) and the second was the average global temperature curve.

An upward trend

Actually, the CO2 curve began its upward march about 18,000 years ago when it was a little under 200 parts per million (ppm) and earth was much colder. By the time it reached 270 ppm about 11,500 years ago, the warmer conditions accompanying this curve made it possible for the emergence of agriculture. Over the past million years, CO2 levels never exceeded 280-300 ppm. They always went back to 200 ppm before rising again in a cyclical fashion. They remained steady at close to 280 ppm for 10,000 years until, beginning in the mid-19th century, they began to rise again as humans burnt coal and oil to fuel the industrial revolution, and burnt forests to expand agriculture and settlements. From a mere 0.2 billion tonnes of CO2 emissions in 1850, annual emissions increased to 36 billion tonnes by 2018. If all this CO2 had accumulated in the atmosphere, we can say that human life would have been altered beyond recognition. Nature has been rather kind to us so far — about one-half of all CO2 emissions have been sanitised from the atmosphere, equally by growing vegetation on land and by absorption in the oceans. Thus, the levels of CO2 in the atmosphere reached 407 ppm in 2018, a level last experienced by earth some three million years ago.

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The Hindu, 10 June, 2020, https://www.thehindu.com/opinion/op-ed/flattening-the-climate-curve/article31789777.ece?homepage=true


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