Cities sign climate pledge in boost to global deal

Leading cities and regions on Thursday promised ambitious cuts to emissions blamed for climate change, hoping to boost efforts for a global deal. The commitment was the latest in a series of pledges during a week of climate events in New York aimed at building momentum for a year-end conference in Paris that seeks to draft a landmark UN agreement. California, which is by far the most populous US state, has promised ambitious action on climate change despite political deadlock in the US Congress.

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