We need a picture in order to answer the question.
1. <span>the process started with the collapse of a nebula
The universe almost certainly didn't start from the collapse of a nebula.
2. The mantle is the middle layer.</span>
Nonrenewable resources either don't replenish themselves, or don't do so in a timely fashion that keeps up with our demand. Therefore, we need to cut our consumption to prolong the resources supply.
