27. Which of the following is the most likely cause of the recent tend noted for all three gases?
A. Increased burning of wood and biomass for fuel
B. Increased number of livestock being raised
C. Increased combustion of fossils fuels
D. Global climate change
A. Increased burning of wood and biomass for fuel
B. Increased number of livestock being raised
C. Increased combustion of fossils fuels
D. Global climate change
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