Conventional paved surfaces trap atmospheric heat, particularly in cities because of their many paved streets, highways and parking lots. That is making the urban heat island effect more intense in busy metropolitan areas such as Philadelphia. Combined with climate change impacts, cities are experiencing even more intense urban heat. Kamil Kaloush, a professor in the School of Sustainable Engineering and the Built Environment, part of the Fulton Schools, talks about the “cool pavement” materials developed to help mitigate city heat. The article reports on the cooling street pavements being used in Phoenix that are lowering surface temperatures — but not doing as quite as well at cooling the surrounding air.