There’s been a dramatic groundswell of “bottom-up” climate leadership from U.S. states, cities and businesses in the face of a federal retreat on climate action. From state legislation mandating cleaner electricity sources to city policies encouraging all-electric buildings, these local ...

High up in the stratosphere, naturally occurring ozone reflects solar radiation back into space, protecting people and the planet from harmful ultraviolet rays. But closer to Earth’s surface, rising ozone levels – formed when pollutants from a wide range of sources react ...

U.S. states, cities and businesses are an essential part of the response to the global climate crisis – and their role is ever more crucial as the Trump administration moves to pull the United States from the historic Paris Agreement. ...

Because countries’ commitments are not enough, and cities, local governments and businesses can only do so much to keep climate impacts from reaching the most dangerous levels, we need to strengthen the mutually reinforcing relationship between national and subnational climate action ...

As the recent Global Climate Action Summit underscored, we’re seeing a steady rise in the number of commitments by cities, states and provinces to address climate change, with over 17,500 actions registered on the NAZCA Climate Action Portal. Not only are ...