Reply #5: Do they mention "An Inquiry into the Human Prospect"

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by Robert L. Heilbroner? 1974 "But even if we make the heroic assumption that all these difficulties will be overcome, so that another century of uninterrupted industrial growth, with its thousandfold increase in required inputs, will face no constraints from resource shortages, there remains one barrier that confronts us with all the force of an ultimatum from nature. It is that all industrial production, including, of course, the extraction of resources, requires the use of energy, and that all energy, including that generated from natural processes such as wind power or solar radiation, is inextricably involved with the emission of heat.
The limit on industrial growth therefore depends in the end on the tolerance of the ecosphere for the absorbtion of heat."