Fact 1: Carbon dioxide concentrations in the air have increased over the last decade dramatically. Fact 2: Carbon dioxide is the chief culprit in the increased threat of global warming in recent decades. Given the two facts above, what has led to the increase in global warming?
Choices:
(A). Greenhouse gases
(B). movements in the earth's crust
(C). Increase in carbon dioxide
(D). Greenhouse gasses
(E). forest is destroyed
(F). Burning fuel and air
(G). movement of tectonic plates
(H). tectonic plates being pushed together
Answer:
(C).