Question

1. how do clouds affect earths energy budget?

they can both warm (absorb longwave) and cool (reflect sunlight).
they always warm the earth by acting as blanket to the earth.
they always cool the earth by acting as a sun shield for the earth.
they have no effect.

Explanation:

To determine the correct answer, we analyze the role of clouds in Earth's energy budget. Clouds have a dual effect: they reflect incoming solar radiation (shortwave) which cools the Earth, and they absorb and re - emit longwave radiation (from the Earth's surface), which warms the Earth. The option "They always warm the Earth..." is incorrect because clouds don't always warm; the option "They always cool the Earth..." is wrong as they don't always cool; and the option "They have no effect" is clearly incorrect. The first option correctly describes the dual role of clouds.

Answer:

A. They can both warm (absorb longwave) and cool (reflect sunlight).