Climate change-Cloze

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

Environment Secretary Margaret Beckett said the report's conclusions a shock to many people.

"The thing that is perhaps not so familiar to members of the public... is this notion that we to a tipping point where change could be irreversible," she BBC Radio 4's Today programme.

"We're not about it over five minutes, of course, maybe over a thousand years, but it's the irreversibility that I think it home to people."