“The problem before us today is how to eliminate starvation and low living standards for two-thirds of mankind without ruining the planet’s ecological balance in the process. This cannot be done without assistance from space.
“Man, the cutting edge of terrestrial life, has no rational alternative but to expand the environmental and resource base beyond Earth. Global development, therefore, must be based on an open world concept and include both the development of extraterrestrial resources and the wiser management of our terrestrial resources. This is the extraterrestrial imperative. Its central goal is the preservation of civilization."
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Krafft Ehricke
The Extraterrestrial Imperative, 1960s
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