The amount of carbon dioxide in Earth's atmosphere has been increasing over the last 50 years because of
A) global warming.
B) the growth of the ozone hole.
C) the burning of fossil fuels.
D) increased energy output from the Sun.
E) increased magnetic activity in the Sun.

Question

Quizplus · Accepted Answer

The increase in carbon dioxide levels is primarily due to the burning of fossil fuels, which releases CO2 as a byproduct.

The Amount of Carbon Dioxide in Earth's Atmosphere Has Been