Global Warming!
•Many scientists believe that global warming caused by greenhouse gases may result in elimination of Arctic regions including the tundras
•Since 1/3 of world's soil-bound carbon is in permafrost so as this starts to thaw, its organic contents begin to decay which releases carbon dioxide
•Especially vulnerable because the tundra is slow to repair itself from physical disturbances
•Ozone depletion means stronger UV rays will hit
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