Global heat budget refers to the balance between which components?

• A. Incoming and outgoing solar radiation
• B. Wind energy and ocean heat
• C. Ground and atmospheric temperature
• D. Solar radiation and geothermal heat

Answer: (A)

The global heat budget centers on the balance of energy entering and leaving the Earth system. Energy from the Sun arrives as solar radiation, warming the planet. To stay in steady climate, the Earth must also emit energy back to space, mainly as longwave infrared radiation (with some energy reflected back by clouds and the surface). When these two flows roughly match, the planet’s average temperature remains stable. The other processes—wind and ocean currents redistributing heat, ground versus atmospheric temperatures as outcomes of this balance, and geothermal heat contributing only a tiny amount—don’t define the main balance. So the best view is the exchange between incoming solar energy and outgoing energy to space.