Multiple Choice
How has the CO2 concentration in Earth's atmosphere changed over the past thousand years?
A) There are no means of measuring the CO2 concentration in Earth's atmosphere for times so far past.
B) The CO2 concentration has remained absolutely constant.
C) The CO2 concentration has increased steadily.
D) The CO2 concentration was relatively constant for about 800 years but has increased significantly since 1800 A.D.
Correct Answer:
Verified
Correct Answer:
Verified
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