North America got its first national park cityA city once dubbed “the dirtiest in the US” has been designated North America’s first national park city. Such efforts were rewarded this week when Chattanooga (main picture) was declared the world’s third national park city, after London and Adelaide. The distinction is granted by the UK-based National Park City Foundation, a grassroots movement to make cities “greener, healthier, and wilder”. “National parks are often called America’s best idea – one that has inspired people across the globe,” Dan Raven-Ellison, founder of the National Park City Foundation, told Positive News. “That same spirit has led London to become the world’s first national park city, and now, in a powerful cultural exchange, Chattanooga is following suit as America’s first.