Energy
Definition: The ability to do work.
- Humanity has an enormous appetite for energy.
- Energy cannot be destroyed, only transformed from one form to another. 
Types of Energy
Kinetic, potential, internal, electromagnetic, chemical, and nuclear energy.

Radiation from Sun
From fusion of atoms in the sun. Technically, fossil fuels and wind energy fall under here (derivative energy sources).
Radioactive Decay
Of fissionable atoms contained in Earth's crust.
Gravitational Potential Energy
Relative movement of celestial bodies. Like tides, wind energy.

Energy Resources on Earth

Renewable Energy
Continuie in perpetuity
Not depleted by use
Units of energy flux: J/s or W.
Depletable Energy Stores
Stored energy, depleted by consumption, not replenished on the time-scale of human energy use. 
Use of energy stores: J. 
Solar and Wind
Solar: 5000x current human energy use. Wind: 50x.
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