Like street comer prophets proclaiming
that tile end is near, scientists who study the earth’s atmosphere have been
issuing predictions of impending doom for the past few years without offering
any concrete proof. So far even the experts have had to admit that no solid
evidence has emerged that this is anything but a natural phenomenon. And the
uncertainty has given skeptics-especially Gingrichian politicians--plenty of
ammunition to argue against taking the difficult, expensive steps required to
stave off a largely hypothetical calamity. Until now, A draft report currently circulating on the Internet asserts that the global temperature rise can now be blamed, at least in part, on human activity. Statements like this have been made before by individual researchers-who have been criticized for going too far beyond the scientific conse A. an important factor affecting global temperature is included in the simulations B. an increasing number of scientists show confidence in the computer models C. they successfully predicted temperature changes after a volcano eruption D. a number of studies produce more positive results 我来回答: 提交
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