For questions 25-32, choose the answer (A, B, C or D) that best completes each sentence.
Mark your answer on the answer sheet.
There is an example at the beginning (0).
A wrong calculation?
Glaciologists fear they may have seriously underestimated the potential for melting ice sheets to contribute to catastrophic sea-level rises of a metre or more (0) in the coming decades. The ice sheets of Greenland and Antarctica would raise sea levels by 65 metres if they
completely. However, a survey
that most glaciologists believe melting could be more rapid and severe than previously estimated. They believe that the melting of the ice sheets would raise the average global sea level by 29 cm in this century
. But there is a chance of it increasing even
by a catastrophic 84 cm . This would take the total sea-level increase to
over 100 centimetres. The impact of a metre rise in
sea level would potentially be severe, resulting in the forced displacement of millions of people this century. Rising sea levels are one of the greatest uncertainties of climate change. A warmer world not only causes oceans to expand thermally
additionally leads to faster melting of mountain glaciers and some regions of the polar ice sheets. However, glaciologists are uncertain about how the ice sheets will respond
increasing global temperatures and climate change. One of the most challenging issues facing glaciologists is to work out how much of the melting is due to natural variation and how much is due to emissions of man-made greenhouse gasses.
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