Three sources of energy

The three main sources of energy are:

1. Renewable Energy: These sources are naturally replenished on a human timescale. Examples include solar, wind, hydro, geothermal, and biomass.
2. Non-renewable Energy: These sources exist in finite quantities and are consumed much faster than they are formed. The primary examples are fossil fuels like coal, oil, and natural gas, as well as nuclear fuel (uranium).
3. Nuclear Energy: While often categorized under non-renewable due to uranium's finite supply, nuclear energy is distinct because it is generated through nuclear reactions (fission or fusion) rather than combustion.