1.
Smoke is clouding our view of global warming, protecting the planet from perhaps
three-quarters of the greenhouse effect. That might sound like good news, but
experts say that as the cover diminishes in coming decades, we are facing a
dramatic increase of warming that could be two or even three times as great as
official best guesses. 2. This was the dramatic conclusion
reached last week at a workshop in Dahlem, Berlin, where top atmospheric
scientists got together, including Nobel Prize winner Paul Crutzen and Swedish
scientist Bert Bolin, former chairman of the UN's Intergovernmental Panel on
Climate Change (IPCC). 3. IPCC scientists have suspected for a
decade that aerosols (浮质) of smoke and other particles from burning rainforest,
crop waste and fossil fuels are blocking sunlight and counteracting the warming
effect of carbon dioxide emissions. Until now, they reckoned that aerosols
reduced greenhouse warming by perhaps a quarter, cutting increases by 0.2℃. So
the 0.6℃ of warming over the past century would have been 0.8℃ without
aerosols. 4. But the Berlin workshop concluded that the real
figure is even higher—aerosols may have reduced global warming by as much as
three-quarters, cutting increases by 1.8℃. If so, the good news is that aerosols
have prevented the world getting almost two degrees warmer than it is now. But
the bad news is that the climate system is much more sensitive to greenhouse
gases than previously guessed. 5. As those gases are expected
to continue accumulating in the atmosphere while aerosols stabilize or fall,
that means "dramatic consequences for estimates of future climate change", the
scientists agreed in a draft report from the workshop. A.
Atmospheric Scientists B. The Calculations Made at the Berlin
Workshop C. The Previous Calculations of the Effect of
Aerosols D. The Scientists' Agreement E. The
Authoritative Conclusion F. Greenhouse Gases
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Paragraph 2 ______
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Paragraph 3 ______
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Paragraph 4 ______
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Paragraph 5 ______
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A. will influence future climate change
B. was somewhat surprising
C. will rise rapidly
D. was known to us all
E. was much higher than had been expected
F. will drop dramatically
When the cover diminishes in the coming decades, temperature ______.
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The conclusion reached at the Berlin workshop ______.
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The Berlin workshop concluded that the real figure ______.