The Main Cause of the Increase in the Amount of CO₂

question 55

Multiple Choice

The main cause of the increase in the amount of CO₂ in Earth's atmosphere over the past 150 years is

• A) increased worldwide primary production.
• B) increased worldwide standing crop.
• C) an increase in the amount of infrared radiation absorbed by the atmosphere.
• D) the burning of larger amounts of wood and fossil fuels.

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