Global warming is destined to have a far more destructive and earlier impact than previously estimated, the most authoritative report yet produced on climate change will warn next week.
A draft copy of the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC) shows the frequency of devastating storms will increase dramatically. Sea levels will rise over the century by around half a meter; snow will disappear from all but the highest mountains; deserts will spread; oceans will become acidic, leading to the destruction of coral reefs and atolls; and deadly heatwaves will become more prevalent.
The impact will be catastrophic, forcing hundreds of millions of people to flee their devastated homelands, particularly in tropical, low-lying areas, while creating waves of immigrants whose movements will strain the economies of even the most affluent countries.
The really chilling thing about the IPCC report is that it is the work of several thousand climate experts who have widely differing views about how greenhouse gases will have their effect. Some think they will have a major impact, others a lesser role. Each paragraph of this report was therefore argued over and scrutinized intensely. Only points that were considered indisputable survived the process.
"This is a very conservative document -- that's what makes it so scary," one senior UK climate expert said.
Climate concerns are likely to dominate politics next month. US President George W. Bush is to make the issue a part of his State of the Union address on Wednesday while the IPCC report's final version is set for release on Feb. 2 in a set of global news conferences.
Although the final wording of the report is still being worked on, the draft indicates that scientists now have their clearest idea so far about future climate changes, as well as about recent events. It points out that: 12 of the past 13 years were the warmest since records began; ocean temperatures have risen at least 3km beneath the surface; glaciers, snow cover and permafrost have decreased in both hemispheres; sea levels are rising at the rate of almost 2mm a year; cold days, nights and frost have become rarer while hot days, hot nights and heatwaves have become more frequent.
And the cause is clear, say the authors: It is very likely that [man-made] greenhouse gas increases caused most of the average temperature increases since the mid-20th century, the report says.
To date, these changes have caused global temperatures to rise by 0.6?C. The most likely outcome of continuing rises in greenhouses gases will be to make the planet a further 3?C hotter by 2100, although the report acknowledges that rises of 4.5?C to 5?C could be experienced. Ice-cap melting, rises in sea levels, flooding, cyclones and storms will be an inevitable consequence.
The report reflects climate scientists' growing fears that Earth is nearing the stage when carbon dioxide rises will bring irreversible change to the planet.
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A carbon level surge raises fears of runaway global warming
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