What is one possible effect of global warming? The oceans may evaporate and continents could become larger. Areas that support agriculture could become deserts. Lower temperatures could result in lower population levels. The earth's deserts may disappear.

I believe the answer is B. With the ice caps melting the ocean would only continue to rise so it isn't A. And it isn't lower temperatures because the temperature would be increasing not decreasing. And I am almost completely certain that the deserts will not go anywhere due to global warming.