The fragment “… the melting of the Greenland ice sheet could result in a substantive sea level rise

The fragment “… the melting of the Greenland ice sheet could result in a substantive sea level rise over centuries rather than millennia.” (lines 33-35) means that

a

abrupt changes in the Earth environment might happen sooner than expected.

b

the rise of sea levels will definitely only take place a thousand years from now.

c

ice sheets will endure the sudden climate change caused by harmful greenhouse gases.

d

it is impossible to predict whether the melting of polar ice sheets will actually take place.

e

the melting of polar ice sheets is a much welcome phenomenon that has been caused by sudden climate change.

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