Water for millions at risk as glaciers melt away

Facts are dangerous tools, part the who-remembers-anymore-but-it-is-a-large number.

Water for millions at risk as glaciers melt away Crisis threatens South America and Asia as glaciers melt away.

he world's glaciers and ice caps are now in terminal decline because of global warming, scientists have discovered. A survey has revealed that the rate of melting across the world has sharply accelerated in recent years, placing even previously stable glaciers in jeopardy. The loss of glaciers in South America and Asia will threaten the water supplies of millions of people within a few decades, the experts warn.
Georg Kaser, a glaciologist at the University of Innsbruck, Austria, who led the research, said: “The glaciers are going to melt and melt until they are all gone. There are not any glaciers getting bigger any more.”

Loss of land-based ice is one of the clearest signals of global temperature rise, and the state of glaciers has become a key argument in the debate over climate change. Last year, New Scientist magazine published a letter from the television botanist David Bellamy, a renowned climate sceptic, which claimed that 555 of 625 glaciers measured by the World Glacier Monitoring Service have been growing since 1980. His claim was quickly discredited, but the perception that glaciers are both growing and shrinking remains.

Dr Kaser said that “99.99% of all glaciers” were now shrinking. Increased winter snowfall meant that a few, most notably in New Zealand and Norway, got bigger during the 1990s, he said, but a succession of very warm summers since then had reversed the trend. His team combined different sets of measurements which used stakes and holes drilled into the ice to record the change in mass of more than 300 glaciers since the 1940s. They extrapolated these results to cover thousands of smaller and remote glaciers not directly surveyed.

The results revealed that the world's glaciers and ice caps - defined as all land-based ice except the mighty Greenland and West Antarctic ice sheets - began to shrink far more quickly in 2001. On average, the world's glaciers and ice caps lost enough water between 1961 and 1990 to raise global sea levels by 0.35-0.4 mm each year. For 2001-2004, the figure rose to 0.8-1mm each year.

Writing in the journal Geophysical Research Letters, the scientists say: “Late 20th century glacier wastage is essentially a response to post-1970 global warming.” Dr Kaser said: “There is very, very strong evidence that this is down to human-caused changes in the atmosphere.”

Are we screwed or what? Is it too early to make a martini? (parenthetical note: have re-discovered a love for martinis, made the old fashioned way, with gin and sweet vermouth)

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This page contains a single entry by Seth A. published on October 11, 2006 11:23 AM.

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