"We don't know exactly when out fossil fuels will run out... but by the end of the century, our oil and natural gas supplies will be virtually non-existent, and limited coal supplies will be restricted to only a handful of countries. ...We are at the peak of a remarkable two-hundred-year glitch in the history of civilization and are about to embark on the descent. The coming changes will be earth-shattering."
January 1, 1970
https://en.wikiquote.org/wiki/Steve_Hallett