Philadelphia and Pittsburgh are both on Bloomberg Philanthropies\u2019 list of 20 American cities being recognized for leading the way on climate action, each receiving up to $2.5 million to accelerate existing sustainability work. We talk with the director of Philly\u2019s Office of Sustainability, Christine Knapp, and Pittsburgh\u2019s Chief Resilience Officer, Grant Ervin. Plus: what does a new state law limiting landowner liability mean for outdoor recreation in Pennsylvania?