How Entropy Powers The Earth (Big Picture Ep. 4/5)

The video explains Earth's energy balance, highlighting that while the Earth receives and radiates energy, the key is the form of energy. Useful energy is low entropy and can perform work, while useless energy is high entropy and cannot. Examples like water behind a dam and gasoline illustrate energy conversion. The Sun provides low entropy energy, which Earth eventually radiates as high entropy infrared photons. The concept of entropy and energy equilibrium is crucial, as it determines the usability of energy.

What would happen if the entire sky were at the temperature of the sun, according to the text?

Discuss the implications of energy conservation in the context of useful and useless energy.