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Hal Clement - Nitrogen Fix

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Hal Clement Nitrogen Fix

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Annotation
The Nitrogen Fix is a 1980 science fiction novel by Hal Clement. The plot revolves around a nomadic family in a future where all oxygen in the Earth's atmosphere has combined with nitrogen, so the atmosphere is mostly nitrogen with traces of water, nitrogen oxides and carbon dioxide, and the seas are very dilute nitric acid.
The family is allied with an alien, an octopus-like being who can survive in the new atmosphere. Humans must live in shelters with oxygen-generating plants, or use suitable breathing equipment. Some of Earth's original life forms have mutated to survive in the changed atmosphere. Since almost no metals can exist in the corrosive atmosphere, any technology is based on ceramics or glass.
Some humans are suspicious of the aliens, and even blame them for the change to the atmosphere, since they seem to be adapted for it. The family have an almost fatal encounter with a group of such people, who are holding another alien hostage. However, the two aliens are able to pool memories biochemically, so that they become the same personality in two bodies. Their combined knowledge and skills help the humans to escape.
At the end the aliens reveal that they are basically tourists or scientists, and they travel from one system to another over thousands of years. Atmospheres "mature" when the nitrogen absorbs all the oxygen, the cause being the inevitable evolution of bacteria that use gold to catalyze the reaction. It is hinted, but not stated outright, that human mining of gold triggered this reaction.


Hal Clement
The Nitrogen Fix
A distant second but thanks
1980 Illustrations by Janet Aulisio
An ACE Book First Ace Printing: September 1980
First Mass Market Edition: October 1981
I
Delivery, Delayed
The golden brown sky was losing some of its uniformity with patches of darker scud starting to show to the west. There was still no wind, and the water was merely choppy, but Kahvi and Earrih were getting more and more uneasy about the kilometer which still separated them from the Canton shore.Milton Island was closer behind, but the cove on its south side would offer little protection if the wind really rose. The rafts, even with their present load, could not be sunk Newell tissue was far too buoyant but they could lose the cargo which had taken weeks to collect. The shelter between the Canton shore and the Sayre islets was looking more and more inviting.
You were right, Kahv. We should have worked around the shore; we could have spared another day or so. Some of Earrins words were spoken aloud, but since his breathing mask muffled the more subtle phoneme distinctions, hand gestures conveyed much of the thought.
His wife answered with a single, silent nod, not taking her eyes from the shore ahead for longer than was needed to read his signals. She got no particular thrill out of having been right; she had, after all, conceded the weight of the mans arguments and had agreed to try the short cut. Risks always had to be taken; it was merely a question of which ones at any particular time. Spending more time out of reach of an air reserve could also have been dangerous.
This time the raft assembly was much larger than usual and correspondingly harder to maneuver. The Hillers had been emphatic about wanting the very largest supply of metal and glass that could be obtained in two months. There had been no way to increase the rate at which the copper came in from the sea, but Bones had found enough glass on the harbor bottom to load not only the floats usually devoted to cargo but a dozen square meters of extra deck space. It was these new, rather hastily fashioned floats which were the main worry.
Even in poling depth the cluster of rafts was awkward. Earrin and Kahvi had sometimes tried masts and sails, but neither knew anything significant about the art and had to depend on following winds. In deep water they usually used sweeps and Bones.
At the moment the human couple were resting, with their sweeps trailing alongside. The Observer, however, was still at work; the tow lines extending from two of the bow floats were taut, and the raft was still moving slowly westward. If bad weather would only hold off for another hour or so, the cargo might be safe after all. If it didnt well, Bones could retrieve it from the bottom, but that would be unwise in sight of the Hillers. The group which had ordered this cargo seemed to have a very low opinion of the natives there had been some mention of Invaders during the negotiations, though neither Kahvi nor Earrin had pursued that line of discussion.
But there was no point in worrying about things which hadnt happened; the important thing was action which would get them to the Canton shore and the jail as quickly as might be. Earrin was already taking up his long oar again. Kahvi did the same. The new child was not yet large enough to interfere.
At least there was no wind against them yet. The foamy tissue rode very high, and the whole structure was much less affected by water currents by those in the air. Progress was steady.
Both rowers looked over their shoulders to see whether the low clouds, colored by dioxide, were appreciably closer, but neither allowed their efforts at the sweeps to slacken, and gradually the shore grew clearer through the haze. The Blue Hills could still be seen to the south, which was a hopeful sign.
Real storms, complete with rain and wind, were usually preceded by clouds down to the surface.
This fact helped Kahvi to keep her hopes up; Earrin could not keep memory of the frequent exceptions to it out of his mind.
Bones, under water fifty meters ahead, was giving no particular thought to the weather. Neither was the rafts other occupant, playing quietly with her toys in the air tent and looking up every little while to see whether her parents were doing anything new. The transparent tissue of the tent let her see them clearly enough, though the two thicknesses of it between them rather blurred the adults view of each other.
Danna had never in her memory been this far from shore, but was quite used to having the floats tossed even more violently than they were now, so she saw no reason to be afraid. Unless she was told to put on breathing gear, she would assume that everything was all right with the raft-and even then she would probably suppose it was only a drill. She was well along in acquiring the hang-ups needed for survival as a Nomad. She already knew how to check the bubbles of transparent tissue in which the Sparrel pseudolife produced breathing oxygen. She could even be trusted to warn her parents if the rise in tent pressure indicated that cartridge material was becoming saturated, though she had not been trustedwith the delicate task of bleeding off excess air. She was not, of course, strong enough to bring buckets of nitrogen under the raft to restore the tents breathing balance.
She did, however, know smoke when she saw it, and it was Danna who called her parents attention to what lay ahead. Her voice came clearly through the tent tissue as the rafts drew within three hundred meters of the Canton shore.
Mother! Dad! Isnt that a fire on the other side of the hill? The clouds are going up, so something must be hot!
Her elders stopped rowing and sprang to their feet, drawing the sweeps inboard by habit. They had been watching their goal, but had not looked carefully at the darkness above it. Neither could see, very clearly at that distance; their mask windows were of salvaged window glass, and their eyes middle-aged.
Even after the child called the smoke to their attention, it was hard for them to be sure t at it was not ordinary rain scud. The ubiquitous oxides of nitrogen could be found in both.
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