Which of the following statements concerning atmospheric CO2 levels or greenhouse warming is FALSE?单项选择题

A

Greenhouse warming naturally occurs on Earth and is the reason life exists, so our concern is about human increases in greenhouse warming.

B

If they continue to rise at the present rate, by the end of this century atmospheric CO2 levels will be higher than at any time in the Earth’s past.

C

Climate systems have some tipping points, that once we pass them, climate will not immediately respond even if we then decrease CO2 levels.

D

At present, atmospheric CO2 levels are higher now than they have been at any time over the past three million years of Ice Ages.

E

Although we are concerned about increases in atmospheric CO2 and methane levels, water vapor is the main greenhouse gas in our atmosphere.

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