Recent evidence from polar ice core analysis shows that, until now, carbon dioxide levels have never exceeded _______________ ppm in the last 800,000 years.

Name: Recent evidence from polar ice core analysis shows that, until now, carbon dioxide levels have never exceeded _______________ ppm in the last 800,000 years.
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Recent evidence from polar ice core analysis indicates that carbon dioxide levels have never exceeded 300 ppm in the last 800,000 years until the recent industrial era.

Recent Evidence from Polar Ice Core Analysis Shows That, Until