Question

Select the correct answer from the list.(1 point)

Between 400,000 years ago until 1950, the levels of carbon dioxide in the atmosphere never exceeded
parts per million. Today, carbon dioxide levels have exceeded parts per million.

Answer 1

[AI-generated answer — Bot GPT 3.5]

Between 400,000 years ago until 1950, the levels of carbon dioxide in the atmosphere never exceeded 300 parts per million. Today, carbon dioxide levels have exceeded 400 parts per million.