The Levels of Carbon Dioxide in the Atmosphere

question 43

Multiple Choice

The levels of carbon dioxide in the atmosphere

• A) peaked around 1950 and have begun slowly decreasing since then.
• B) are high but not higher than the highest estimated levels in the last 420,000 years.
• C) are estimated to be higher than at any time in the past 420,000 years.
• D) began decreasing when the burning of fossil fuels increased.

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