Which of the following statements is NOT true.单项选择题

题目图片
A

a. CO2 levels are currently in excess of 400 ppm

B

b. CO2 levels have naturally fluctuated between 200 and 300 ppm during pre-industrial times.

C

c. Scientists are able to measure historic levels of CO2 from looking at ice cores.

D

d. High levels of CO2 are linked with a decrease in temperature.

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