Which statement best describes the atmospheric energy budget?

• A. Incoming solar energy minus reflected energy plus emitted longwave radiation
• B. Only reflected energy from the surface
• C. Only emitted longwave radiation to space
• D. Latent heat transport is the sole component of the energy budget

Answer: (A)

The energy budget of the atmosphere is all about balance: energy coming in from the Sun and energy leaving to space, with some of the solar energy reflected and some absorbed, and most of the energy exiting as infrared (longwave) radiation. The best description matches this by taking the incoming solar energy and subtracting the portion that's reflected, giving the net solar energy absorbed, and then including the energy that escapes to space as longwave radiation. This captures the two main radiative processes that control warming or cooling: how much solar energy actually gets absorbed, and how much energy the Earth releases back as heat. The other statements fall short because they ignore either the absorption of solar energy, or the longwave energy loss, or lump in other processes as the sole component.