Starting then Stopping Geoengineering Could Dangerously Accelerate Climate Change : Scientific American

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  • @kassem
    Kassem CC BY-NC-SA
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    @lyco
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    Press Release: Geoengineering approaches to reduce climate change unlikely to succeed
    ▻http://www.egu.eu/news/88/geoengineering-approaches-to-reduce-climate-change-unlikely-to-succeed

    Reducing the amount of sunlight reaching the planet’s surface by geoengineering may not undo climate change after all. Two German researchers used a simple energy balance analysis to explain how the Earth’s water cycle responds differently to heating by sunlight than it does to warming due to a stronger atmospheric greenhouse effect. Further, they show that this difference implies that reflecting sunlight to reduce temperatures may have unwanted effects on the Earth’s rainfall patterns. The results are now published in Earth System Dynamics, an open access journal of the European Geosciences Union (EGU).

    #géoingénierie #climat

    Kassem CC BY-NC-SA
    • @lyco
      Lyco

      Starting then Stopping Geoengineering Could Dangerously Accelerate Climate Change
      ▻http://www.scientificamerican.com/article.cfm?id=starting-then-stopping-geoengineering-could-accel

      The report from an international team of researchers used 12 models to determine what might happen if the planet used so-called solar radiation management (SRM) or atmospheric shading by injecting water vapor or sulfates into the atmosphere to offset 1 percent annual increases in CO2 concentrations for 50 years, then abruptly stopped the experiment.

      They found that upon ending the experiment, the planet would experience a rapid increase in global mean temperature, along with increases in global mean precipitation rate and decreases in sea ice cover.

      In other words, all the global climate changes averted for 50 years thanks to SRM would be made up within five to 10 years.
      [...]
      “Right now, in my opinion, there’s no evidence that geoengineering is less risky than global warming,” Robock said.
      [...]
      In the paper, the authors wrote that “the expectation that humankind would be able to continuously maintain a geoengineering effort at the required level for this length of time is questionable, to say the least.”

      Au mieux c’est inefficace, au pire c’est hyper dangereux... ca m’etonnerait qu’on se lance pas la-dedans.

      Lyco
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