Based on the information and diagram, which process is most likely to increase the amount of CO2 in the atmosphere?

The carbon cycle is illustrated above. Two of the essential processes involved are photosynthesis in green plants and algae and respiration by almost all organisms. Respiration, as well as burning and other natural decomposition (breakdown) processes, contributes to the amount of CO2 in the air and soil. Photosynthesis uses up CO2 and produces O2, which, in turn, is used up in respiration and the burning of fossil fuels such as coal, oil, and gas.

Based on the information and diagram, which process is most likely to increase the amount of CO2 in the atmosphere?
A . planting more trees
B . reducing the number of cars in use
C . increasing the amount of vegetables and fruit in the human diet
D . doubling the amount of burning of fossil fuels
E . continued experimentation with the potential uses of solar energy

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Answer: D