Cities have taken a leading role in efforts to reduce greenhouse gas emissions. As federal and state climate policy waxes and wanes, many of the largest U.S. cities have pledged themselves to ambitious sustainability goals, as have smaller communities across the country. City-level policy makers, facing a range of political constraints, a thicket of federal and state laws, and varying degrees of municipal authority, need to figure out how to meet their climate commitments.Urban...

Cities have taken a leading role in efforts to reduce greenhouse gas emissions. As federal and state climate policy waxes and wanes, many of the largest U.S. cities have pledged themselves to ambitious sustainability goals, as have smaller communities across the country. City-level policy makers, facing a range of political constraints, a thicket of federal and state laws, and varying degrees of municipal authority, need to figure out how to meet their climate commitments.Urban...