Perhaps the question was premature in Turner's time, but not now. Currently we see around us an ever more apparent loss of vigor of our society: incr… - Robert Zubrin

Currently we see around us an ever more apparent loss of vigor of our society: increasing fixity of the power structure and bureaucratization of all levels of life; impotence of political institutions to carry off great projects; the proliferation of regulations affecting all aspects of public, private, and commercial life; the spread of irrationalism; the banalization of opular culture; the loss of willingness by individuals to take risks, to fend for themselves or think for themselves; economic stagnation and decline, the decleration of the rate of technological innovation...Everywhere you look, the writing is on the wall.

Miners operating among the asteroids will be unable to produce most of their necessary supplies locally. There will thus be a need to import food and other necessary goods either from Earth or Mars.

In fact, there ar no such things as "natural resources." There are only natural raw materials. It is human ingenuity that turns natural raw materials into resources.

When a population of organisms grows in a finite environment, sooner or later it will encounter a resource limit. This phenomenon, described by ecologists as reaching the “carrying capacity” of the environment, applies to bacteria on a culture dish, to fruit flies in a jar of agar, and to buffalo on a prairie. It must also apply to man on this finite planet. JOHN P. HOLDREN and PAUL R. EHRLICH Global Ecology (1971) 1 Here is the difference between the animal and the man. Both the jay-hawk and the man eat chickens, but the more jay-hawks the fewer chickens, while the more men the more chickens. HENRY GEORGE