Which of the following conditions most likely produces warming at the Earth's surface?

Question

Quizplus · Accepted Answer

An increase in high-level global cloud cover is most likely to produce warming at the Earth's surface as it traps outgoing longwave radiation and reflects incoming shortwave radiation back to the surface. This is known as the greenhouse effect. On the other hand, low-level global cloudiness can reflect incoming solar radiation, causing cooling. A decrease in energy output of the sun would also cause cooling. An increase in sulphur-rich particles in the stratosphere can reflect incoming solar radiation and thereby cause cooling, but this phenomenon is usually localized and short-lived.

Which of the Following Conditions Most Likely Produces Warming at the Earth's