The city of Phoenix has unveiled its new compressed natural gas (CNG) solid waste trucks, which collect trash and recyclables for nearly 400,000 Phoenix households. Currently, the Public Works Department operates six CNG solid waste trucks and within two months, 20 percent of its fleet of solid waste trucks will be CNG vehicles. John Trujillo, Acting Director of the Phoenix Public Works Department, will tell us more about the CNG trucks.
Researchers at the University of Arizona are looking at how to use compressed air to store solar and wind power. Professor Pierre Deymier, director of the School of Sustainable Engineered Systems at the University of Arizona, and graduate student Krishna Muralidharan discuss the project.