Which of the following is not a possible effect of increasing carbon dioxide levels in the atmosphere?

a.) increase in water contamination and floods.
b.) ocean acidification.
c.) cutting down forests.
d.) reduction of cold-related deaths.

answer; i believe that the correct answer is (lung);

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.