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During the Last 800 000,climate Reconstructions Show That CO2 Never

Question 116

Multiple Choice

During the last 800 000,climate reconstructions show that CO2 never changed more than how many ppm upward or downward in any span of less than 1000 years,though it has risen by this amount in the last 13 years?


A) 30.
B) 60.
C) 120.
D) 240.

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