Question

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.