UN climate change talks begin. The talks have been accompanied by little of the razzamatazz that followed the host of celebrities and world leaders that attended last year's event in Copenhagen. The US, UK and EU have all played down the chances of a deal and the Mexican authorities expect about 22,000 people, including 9,000 official delegates and journalists – fewer than half the number that attended the at-times chaotic conference in the Danish capital.
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