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From: Heiny.Henr@Parc-Maxc.Arpa@sri-unix.UUCP
Newsgroups: net.space
Subject: re: Interplanetary Migration for population control
Message-ID: <11805@sri-arpa.UUCP>
Date: Mon, 19-Sep-83 11:33:00 EDT
Article-I.D.: sri-arpa.11805
Posted: Mon Sep 19 11:33:00 1983
Date-Received: Mon, 26-Sep-83 01:29:39 EDT
Lines: 30

From:  Chris Heiny <Heiny.Henr@Parc-Maxc.Arpa>

	"One significant problem with this line of reasoning is that the
vehicles
	used to transport commercial aviation passengers one day are still
around
	to transport more passengers the next day.  In an out bound migration,
the
	vehicles used to transport the passengers are gone from the system once
	they are used.  (I am talking about the interplanetary vehicles, not
the
	shuttles used to move the passengers to Earth orbit.)  I would hate to
	think what would happen to the Earth's supplies of spaceship building
	materials (e.g. titanium) after 100 years of sending out thousands of
ships
	each day"

Detroit has been consuming much more steel to produce autos than it has
in it's natural environs for the past 70 years.  Perhaps titanium, etc.
can be imported to earth.  The ships could even be built on the moon, a
much more reasonable place to construct them: you wouldn't have to lift
them out of earths gravity well.  And the ships would also probably be
used to make round trips: it is probably more economical to send an
partly loaded liner back to earth from the asteroids than to build
another and let that one rust.  Eventually trade between the colonies
and earth would reach a point where vessels would be fully laden each
way (as with trade between the New World and Europe).  Europe was not
denuded of trees and iron during the conquest of the New World.

					Chris