What is the fundamental basis for splitting energy resources into renewable and nonrenewable categories?

Answer

The rate of replenishment relative to the rate of consumption.

The critical distinction rests upon how quickly the resource regenerates compared to how fast humanity uses it. Renewables replenish faster than consumption, while nonrenewables exist in fixed amounts that take geologic time to form.

What is the fundamental basis for splitting energy resources into renewable and nonrenewable categories?
Sourceenergyrenewablenonrenewable