" Global warming at a rate that is unsustainable"

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.

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.

BBC News reported detailly here.