The 15 cities doing more than most to cut carbon

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 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.