Gold

Gold

From The final Science Fiction collection by Isaac Asimov

The plants and animals? Well, we control them. We supervise their breeding and we consume any excess. Maintaining the human population at a reasonable level is more difficult. We cannot allow human births to outstrip human deaths, and we keep the number of deaths as low as possible, of course. This makes our culture a nonyouthful one compared to Earth's. There are few youngsters and a large percentage of those mature and postmature. This produces psychological strains, but there is the general feeling among Settlers that those strains are worth it, since with a carefully controlled population, there are no poor, no homeless, and no helpless.

Again, the water, air, and food must be carefully recycled, and much of our technology is devoted to the distillation of used water, and to the treatment of solid bodily wastes and their conversion to clean fertilizer. We cannot afford to have anything go wrong with our recycling technology, for there is little room for slack. And, of course, even when all goes well, the feeling that we eat and drink recycled materials is a bit unpalatable. All is recycled on Earth, too, but Earth is so large and the natural cycling system so unnoticeable, that Earthpeople tend to be unaware of the matter.

Then, too, there is always the feat that a sizable meteor may strike and damage the outer shell of a Settlement. A bit of matter no larger than a piece of gravel might do damage, and one a foot across would surely destroy and Settlement. Fortunately, the chances for such a misadventure are small and we will eventually learn to detect and divert such objects before they reach us. Still, these dangers weigh upon us, and help mitigate the feeling of over-security that some of us complain about.

With an effort, however, with close attention and unremitting care, we can maintain our ecology, were it not for the matter of trade and travel.

Each Settlement produces something that other Settlements would like to have, in the matter of food, or art, of ingenious devices. What's more, we must trade with Earth as well, and many Settlers want to visit Earth and see some of the things we don't have in the Settlements. Earthpeople can't realize how exciting it is for us to see a vast blue horizon, or to look out upon a true ocean, or to see in ice-capped mountain.

Therefore, there is a constant coming and going among the Settlements and Earth. But each Settlement has its own ecological balance; and, of course, Earth has, even these days, an ecology that is enormously and impossibly rich by Settlement standards.

We have our insects that are acclimated and under control, but what if strange insects are casually and unintentionally introduced from another Settlement or from Earth?

A strange insect, a strange worm, even a strange rodent might totally upset our ecology, inflict damage on our native plants and animals. On numerous occasions, in fact, a Settlement has had to take extraordinary measures to eliminate an unwanted life-form. For months every effort had to be taken to track down every last insect of some species that, in its own Settlement, is harmless, or that, on earth, can keep its depredations local.

Earth Ecology. Photograph by Elena.