During the last 800,000,climate reconstructions show that CO 2 Never changed more than_________ppm upward or downward in any span of less than 1,000 years,though it has risen by this amount in the last 13 years.

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CO2 levels have risen by 30 ppm in the last 13 years, which is more than the 30 ppm change that occurred over any 1,000-year period in the last 800,000 years.

During the Last 800,000,climate Reconstructions Show That CO 2 Never