Nearly 150 years ago, man-made CO2 was introduced into the atmosphere primarily through _____. Currently, _____ is the main contributing factor to increased levels of human-produced CO2 in the atmosphere.
A) the burning of fossil fuels; deforestation
B) deforestation; the burning of fossil fuels
C) respiration; deforestation
D) deforestation; respiration
E) the burning of fossil fuels; the burning of fossil fuels
Correct Answer:
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