It is now an accepted fact that oil is a non-renewable commodity for which production peaks and then declines. Oil is also indispensable for sustaining the industrial world as we know it. The decline of the first, therefore, portends the inevitable decline of the second. The machines which have gradually replaced manual tools over the past few centuries will eventually cease to function, forcing humans to return to essentials.
This is not just speculation or even a theory, but a simple observation of physical events that leads to another observation: our future generations will no doubt have to get along without machines or electricity and ultimately, unable even to produce metal tools, be thrust back into a stone age.
This "radiant" future is the only chance of survival for humans, their only chance to avoid suffocating under the pollution caused by their frenzied activity.