Author Matt Simon Matt Simon is a senior writer at Grist, covering climate solutions. Prior to that, he spent over a decade at Wired magazine. He’s the author of three books, most recently A Poison Like No Other: How Microplastics Corrupted Our Planet and Our Bodies. Matt's Latest Articles Mayors are making climate action personal. It’s working. By Matt Simon ● Environment ● August 23, 2025 As the Trump administration boosts fossil fuels and rolls back regulations, mayors are greening their cities — in more ways than one.