The large increase in atmospheric carbon dioxide in the last 50 years most likely comes a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis

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The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from C. an increase in the burning of fossil fuels.

Fossil fuels contribute greatly to to the increase in atmospheric carbon dioxide. They include coal, natural gas, and more, and when they are burned, one of the combustion products is carbon dioxide.

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