Halting carbon dioxide emissions cannot avert climate [عزيزي الزائر يتوجب عليك التسجيل لمشاهدة الرابط للتسجيل اضغط هنا] change
With carbon dioxide (CO2) in the air approaching alarming levels, even halting emissions altogether may not be enough to avert catastrophic climate change.
A new study by Carnegie Institution scientists suggests that while removing excess CO2 would cool the planet, carbon cycle complexities would limit the effectiveness of a one time effort.
Previous studies have shown that reducing CO2 emissions to zero would [عزيزي الزائر يتوجب عليك التسجيل لمشاهدة الرابط للتسجيل اضغط هنا] not lead to appreciable cooling, because CO2 already within the atmosphere would continue to trap heat. For cooling to occur, greenhouse gas concentrations would need to be reduced.
The possibilities include approaches as diverse [عزيزي الزائر يتوجب عليك التسجيل لمشاهدة الرابط للتسجيل اضغط هنا] as industrial scale chemical technologies and changing land use so more CO2 is naturally absorbed by vegetation.
According to the simulations conducted by the researchers, for every 100 billion tonnes of carbon removed from the atmosphere, average global temperatures would drop 0.16 degrees Celsius, said a Carnegie Institution release.
Further simulations showed that in order to keep CO2 at low levels, the process of CO2 extraction from the air would have to continue for many decades, and perhaps centuries, after emissions were halted.
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