4 ms·

radioactive decay.

• jeffbee 5y ago
  In other words it isn’t renewable, it’s just very long-lived.
  • colechristensen 5y ago
    So is the Sun.
  • connicpu 5y ago
    There's no such thing as infinite energy in this universe. There's enough deuterium in the oceans to power humanity at our current pace until well after the sun expands and makes earth uninhabitable, but that is still a limit where we'd run out.