The increase of atmospheric CO2 levels to 400 ppm has tipped Earth's natural greenhouse effect toward global warming. The rise of CO2 is due to
A) human activity—the burning of fossil fuels (coal, oil, and gas) and deforestation.
B) human activity—overpopulation and increased reliance on solar energy.
C) human negligence—efforts of not recycling waste materials for potential reuse.
D) the industrial revolution and increased cloud cover.
Answer: A
Physics & Space Science
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