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The Recent Increase in Atmospheric CO2 Levels Is Mainly a Result

Question 53

Multiple Choice

The recent increase in atmospheric CO2 levels is mainly a result of an increase in


A) gross primary productivity.
B) the biomass of the biosphere.
C) the absorption of infrared radiation escaping from Earth.
D) cellular respiration by the exploding human population.
E) the burning of fossil fuels and wood.

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