Municipal bond investors have started asking governments to disclose their area's environmental hazards, but a lot of the information they want is not yet known.
Until now, there was no universal, comprehensive methodology for cities around the world to measure their emissions. One of the tool's creators explains its power in the fight against climate change.
Artificial light is a growing problem that’s hurting humans and animals. What are cities doing about it?
Water bills have increased faster than any other and show no signs of slowing down, hitting low-income Americans the hardest.