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- ENVIRONMENT, Page 65Hot Times
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- A balmy 1990 may presage a dangerous climatic trend
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- 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 Americans, was 15.5 degrees C (59.8
- degrees F), while the British, using a different set of
- readings, pegged it at 15.4 degrees C (59.7 degrees F).
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- One hot year does not make a trend, since temperatures
- naturally vary from year to year. But the Americans, at NASA's
- Goddard Institute for Space Studies, pointed out that the new
- data mean that the seven warmest years since 1880 have all
- occurred in the past 11 years. On average, the 1980s were about
- .6 degrees C (1 degrees F) warmer than the 1880s, while 1990
- was .7 degrees C (1.25 degrees F) warmer. That may not sound
- like much, but a mere 5 degrees C (9 degrees F) rise was enough
- to bring the earth out of the last ice age.
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- If global-warming theorists are correct, temperatures could
- rise by another 1 degrees to 4 degrees C (2 degrees to 8
- degrees F) over the next half-century. Unfortunately, no one
- can say whether even a decade-long heat wave confirms this view
- or is merely a glitch. Worse, says Stephen Schneider of the
- National Center for Atmospheric Research: "By the time the
- evidence is irrefutable, it could be too late to do anything."
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