Word: icecaps
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Dates: during 1970-1979
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...restore the Caspian Sea and to slake the "colossal thirst" of users along the way, is to turn rivers now flowing north to the Arctic Ocean southward. Some international scientists fear that without the usual supply of easily frozen fresh water reaching the northern seas, the polar icecap will recede-and the consequent melting will flood the world's seacoasts...
...years, because of the slow precession of Mars (a wobbling of the planet as it rotates through space), the north pole will be tilted so that it receives more solar radiation during the planet's close approach to the sun. The increased radiation would heat up the northern icecap, release large amounts of trapped water into the atmosphere and make enough water available to stir up any lazy creatures that might have hibernated through the long Martian winter. Impossible? Perhaps, says Sagan, but he adds that those who criticize such speculations do so only because of their "chauvinistic" earthbound outlook...
...century. He notes that barnacles hitchhike to new climes by attaching themselves to whales, sailfish and ships' bottoms. Like some commuters who are forced to transfer from train to bus or taxi, Adélie penguins migrate using an integrated transport system. They toddle across the bleak Antarctic icecap on foot, swim in the icy sea and cruise lazily on drifting ice floes...