"It should be possible... to distinguish that part of the GNP... derived from exhaustible and that... derived from reproducible resources, as well as that part of consumption which represents effluvia and that which represents input into the productive system again. Nobody, as far as I know, has ever attempted to break down the GNP in this way..."
January 1, 1970
https://en.wikiquote.org/wiki/Spaceship_Earth