作为对地球负责任的管理者，我们应当进一步对大气层和海洋的状况做出更深入的研究，但是，仅仅停留于研究是不够的。如果现政府不采取法律行动，国会应该帮助着手制定保护措施。西弗吉尼亚州的民主党参议员Robert Byrd提出了一项法案，该法案提议将为私营企业提供经济刺激，这是一个良好的开端。许多人看到，我们国家正准备建设许多新的发电厂来满足我们的能源需求，如果我们还想保护大气层，这些新电站必须要具备有利于环境的条件。

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　　Of all the components of a good night's sleep, dreams seem to be least within our control. In dreams, a window opens into a world where logic is suspended and dead people speak. A century ago, Freud formulated his revolutionary theory that dreams were the disguised shadows of our unconscious desires and rears; by the late 1970s, neurologists had switched to thinking of them as just “mental noise” the random byproducts of the neural-repair work that goes on during sleep. Now researchers suspect that dreams are part of the mind's emotional thermostat, regulating moods while the brain is “off-line”. And one leading authority says that these intensely powerful mental events can be not only harnessed but actually brought under conscious control, to help us sleep and feel better, “It's your dream” says Rosalind Cartwright, chair of psychology at Chicago's Medical Center. “If you don't like it, change it.”

　　Evidence from brain imaging supports this view. The brain is as active during REM (rapid eye movement) sleep-when most vivid dreams occur-as it is when fully awake, says Dr, Eric Nofzinger at the University of Pittsburgh. But not all parts of the brain are equally involved, the limbic system (the “emotional brain”)is especially active, while the prefrontal cortex (the center of intellect and reasoning) is relatively quiet. “We wake up from dreams happy of depressed, and those feelings can stay with us all day” says Stanford sleep researcher Dr, William Dement.

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