According to the passage, carbon dioxide is stored in each of the following EXCEPT A.polar ice caps. B.sedimentary rocks. C.rain forests. D.fossil fuel.
B được đề cập: All living organisms pull carbon dioxide out of the atmosphere and eventually store it in sedimentary rocks within the Earth’s crust.
C và D được đề cập: Man, however, is upsetting the equation by burning fossil fuels and destroying tropical rain forests, both of which release stored carbon dioxide.