London's mayor, Ken Livingstone, now claims that global warming may soon make the Tube unusable in summer, with temperatures in the uncoolable, Victorian-era system becoming threatening to life:

Ken said "You reach a point where the underground will become literally intolerable and you could face the prospect of loss of life." Although he's offered hundreds of thousands of pounds as a reward to find workable air conditioning for the underground, it sounds like the heat will eventually defeat the system. He believes we will have to resign ourselves to closures "if the temperature goes up faster than we fear it's going to".

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