How does solar energy reaching Earth's surface compare to global energy demand?

• A. We receive about the same as the global energy demand; 50% reaches the surface.
• B. We receive about 7000 times the global energy demand; only 13% reaches Earth's surface.
• C. We receive less than the global demand; 5% reaches Earth's surface.
• D. We receive about 7000 times the global energy demand; 90% reaches Earth's surface.

Answer: (B)

Solar energy that reaches Earth is vastly larger than humanity’s energy needs. The Sun delivers far more power to our planet than we ever use, and only a small portion of that input actually makes it to the surface because the atmosphere, clouds, and the planet’s reflectivity soak up or bounce back a lot of it. The figure used here captures that scale: we receive roughly seven thousand times the global energy demand, yet only about thirteen percent of the solar energy that would reach the planet ends up hitting the surface. In other words, there is a huge amount of solar energy available, but atmospheric and surface processes limit how much we can directly capture at ground level.