• Our generation may stand at a crucial breakpoint in history, for we in the presently affluent nations may be the last who can afford to open up the high frontier. What we do during the next ten or twenty years may determine whether future generations will live in a humane and rewarding society, or whether they will spend their lives in desperate contention for the dwindling sustenance afforded by our limited terrestrial resources.

    Philip K. Chapman: Our generation may stand at a crucial breakpoint in history, for we in the presently affluent nations may be the last who can afford to open up the high frontier. What we do during the next ten or twenty years may determine whether future generations will live in a humane and rewarding society, or whether they will spend their lives in desperate contention for the dwindling sustenance afforded by our limited terrestrial resources.