Word: carbons
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Dates: during 1970-1979
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Microscopic carbon fibers pose a threat
Through the greenhouse effect nitrous oxide, acting in the same fashion as carbon dioxide, traps heat within the earth's atmosphere. A rise in the nitrous oxide level could inevitably make the earth warmer, McElroy said...
That does not mean the evolution of intelligence has ended on the earth. Judging by the record of the past, we can expect that a new species will arise out of man, surpassing his achievements as he has surpassed those of his predecessor, Homo erectus. Only a carbon-chemistry chauvinist would assume that the new species must be man's flesh-and-blood descendants, with brains housed in fragile shells of bone. The new kind of intelligent life is more likely to be made of silicon...
Emphysema results in slow smothering since it destroys the inner walls of lungs and hampers the exchange of carbon dioxide for oxygen in the blood...
Barghoorn and Knoll believe that their primitive fossils-the oldest direct evidence of terrestrial life-are the ancestors of modern blue-green algae or photosynthetic bacteria, both of which convert carbon dioxide into food and oxygen. If they are correct, these organisms 3.5 billion years ago were already pumping into the atmosphere the oxygen upon which most of today's terrestrial life now depends...