Which of the following is least likely to be an effect of global warming?

Question: Which of the following is least likely to be an effect of global warming?

A. Increased frequency of hurricanes

B. Loss of fertile delta region as for agriculture.

C. Shrinking of the polar ice regions

D. Decrease rate of photosynthesis in vegetation.

Correct answer is option D (decrease rate in photosynthesis in vegetation) is least likely to be an effect of global warming because it cause plants to provide less evaporation cooling .