- Positive feedback mechanisms
- 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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