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A balmy 1990 may presage a dangerous climatic trend

Is global warming upon us? Many climate experts say it is only a matter of time before heat trapped in the atmosphere by man-made chemicals raises world temperatures, melting polar ice caps, raising sea levels and generally wreaking havoc. Most also go on to caution that it is too soon to declare that the warming has begun. But two studies released last week evoked concern that a shift is already under way. Teams of scientists in the U.S. and Britain found that 1990 was the warmest year in more than a century of record keeping. The average worldwide temperature, said the...

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