positive feedback mechanisms

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  • Positive feedback mechanisms
    • permafrost
      • melting of permafrost in the boreal regions releases methane = a GHG and CO2 = a GHG
    • ice extent
      • melting reveals darker land which absorb more heat from the sun, leads to more warming, leads to melting etc
    • albedo effect
      • the amount of light reflected by a material = albedo. Ice has albedo of 0.9 and water has albedo of 0.2. More ice means more radiation is reflected means less heating means more ice.
    • they AMPLIFY change


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