Which of the following is NOT a reason why the thinning of the polar ice cap would be disastrous to the world?
A.
The polar ice cap plays a crucial role in the world’s weather system.
B.
The thinning of the polar cap might endanger ships on the sea.
C.
The thinning of the polar cap might cause the sea level to be raised.
D.
The thinning of the polar cap might cause some seaside cities and small islands to be swallowed by the sea.