World leaders from 147 countries will arrive in Paris for two weeks of talks to open Nov. 30, which are widely viewed as the last best hope of getting a global climate change deal after 20 years of only incremental progress toward an agreement. The Paris summit of 200 nations comes in the wake of the Nov. 13 terrorist attacks in the city, which have triggered far more heightened security-including what French officials described as "exceptional measures" such as road closings-in advance of world leaders arriving Nov. 29-30 (see related story).
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