(Bloomberg) — Cities, which are home to more than half the world's population, are stepping up efforts to slash pollution, often wresting the fight against climate change away from national governments.

That's the conclusion of CDP, a non-profit group that pushes institutions to detail their greenhouse-gas emissions. Often able to move faster than their national counterparts, metropolitan authorities from London to Sydney and Boston are among a group of 15 setting out the most rigorous plans to achieve carbon or climate neutrality by 2050.

The moves are evidence of ambition by local authorities to do their part in reining in global warming, almost two-thirds of global emissions come from cities. CDP wants to draw attention to their actions to encourage others to make similar commitments.

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