How Has the CO₂ Concentration in Earth's Atmosphere Changed Over

question 266

Multiple Choice

How has the CO₂ concentration in Earth's atmosphere changed over the past thousand years?

• A) There are no means of measuring the CO₂ concentration in Earth's atmosphere for times so far past.
• B) The CO₂ concentration has remained absolutely constant.
• C) The CO₂ concentration has increased steadily.
• D) The CO₂ concentration was relatively constant for about 800 years but has increased significantly since 1800 A.D.

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