A bicyclist rides a bike in New York. As world leaders squabble over how to cut greenhouse gases, city hall is becoming the best hope for reducing heat-trapping emissions. Photographer: Daniel Acker/Bloomberg
A bicyclist rides a bike in New York. As world leaders squabble over how to cut greenhouse gases, city hall is becoming the best hope for reducing heat-trapping emissions. Photographer: Daniel Acker/Bloomberg
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