The life that exists on Earth is dependent on, and inter- related with, the environment; particularly the air, oceans and materials in the Earth itself.
In our modern world, this includes a necessary dependence on oil and natural gas, which power the machines we rely on to function as a society.
Thought must be given in order to understand the processes that occurred in forming these materials in such abundance.
It is known that these materials formed by the death and decay of living forms that preceded our existence in the present day.
Some further thought on this subject should lead to the realization that there would be no other use for oil, gas and coal; except for the functions that they now provide.
These substances are foreign to the realm of nature, even having properties that are hazardous to living beings.
This being the case, we must ask why they were formed at all, since they do not contribute to the support of life itself.
They do, in fact, but only in the purpose for which they are used; a basic support system for the activities occurring in modern society.
This consideration brings to mind the fact that the inevitability of the formation of these material must indicate some predestination in the evolution of life.
If they were not gotten rid of by modern technology, they would remain in the earth until some catastrophe occurred; when they would be released from their earthly prison by some geologic process.
An example of this might be the active volcanism which still persists to this day.
Plate tectonics, causing the movement of the land masses could possibly bring this volcanic activity close enough to these pockets of hazardous material; igniting it, and causing an event of disastrous proportions for people on Earth.
Other considerations might be th presence of so much water and all of the elements needed to support life, as well as the favored position of the Earth related to its distance from the Sun.