The 650,000-Year Record for Carbon Dioxide (CO2)

The 650,000-year record for carbon dioxide (CO2)

Climate reconstructions indicate that carbon dioxide (CO₂) levels

A) are at the highest levels now of any time during the past 650,000 years.
B) have consistently decreased over the past 650,000 years.
C) were highest approximately 350,000 years ago and have decreased since.
D) have fluctuated over the past 650,000 years,so recent upward trends are not a concern.
E) have steadily increased (with some minor fluctuations) over the past 350,000 years.

Correct Answer:

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