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There Are Several Possible Climate Change Tipping Points

Question 12

Multiple Choice

There are several possible climate change tipping points.Which one of the following is not one of these points?


A) atmospheric level of 450 ppm
B) collapse and melting of Greenland ice sheet
C) expansion of Amazon rainforest
D) massive release of methane from Arctic permafrost
E) sharp drop in the ability of oceans to absorb CO2

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