Approximately what fraction of incoming solar radiation is reflected back to space? (Choose the best answer.)

The correct answer is (a) 1/3.

Most of that reflects off of clouds, the remainder reflects off the surface. This energy is not available to the climate system. However, when less incoming energy is reflected, more is absorbed, which would lead to warming of the climate system. Thus climate models need to accurately simulate the albedo effects of the surface and clouds.

Which mechanism transports more heat from low to high latitudes? (Choose the best answer.)

The correct answer is (a) Atmospheric circulation.

While the atmosphere transports most of the heat out of the tropics and toward the poles, the ocean also plays a significant role.