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Rising concentrations of greenhouse gases may have more serious impacts than previously believed, a major scientific report has said. The report, published by the UK government, says there is only a small chance of greenhouse gas emissions being kept below "dangerous" levels.

It fears the Greenland ice sheet is likely to melt, leading sea levels to rise by seven metres over 1,000 years. The poorest countries will be most vulnerable to these effects, it adds.

In the report’s foreword, UK Prime Minister Tony Blair writes that "it is now plain that the emission of greenhouse gases… is causing global warming at a rate that is unsustainable."

Environment Secretary Margaret Beckett said the report’s conclusions would be a shock to many people. "The thing that is perhaps not so familiar to members of the public… is this notion that we could come to a tipping point where change could be irreversible," she told BBC Radio 4’s Today programme. For more please read this report from BBC News. See also this report at the Washington Post website: Debate on Climate Shifts to Issue of Irreparable Change.