How far that we can still use petrolium?

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If we're still using power consumption at this rate (steady rate not increasing)
We will have fuel in the form of Oils for 20 years and if we including Gas it will be 40 years.

So what do you think?
Can we live without Fuel?

If you think only that you get me wrong.
When something lose; the balance of the system will change.

The problem is are we, human race, still be the part of that balance?
Or we don't have value enough for this world.

Ain't in the end we are just parasite that destroying our host to end it all up in the end.

I'm still in wondering.