Over 30 mayors from across the globe have pledged to deliver clean air for the 140 million people living in their cities. Delivering clean air on such a scale will take both ambitious targets and concrete action.
The recent shutdown should improve public health in the area around Three Mile Island and should serve as a reminder that future energy policies rely on truly "clean" sources, and not harmful ones like nuclear power.
Critics say ethane expansion on the banks of the Ohio River, just outside Pittsburgh, will not only prolong fracking but could also trigger a public health disaster.
The health department found no cancer cluster. Residents say they want answers about why there are so many cases and whether pollutants from fracking could be involved.
Study finds decreasing lead in topsoil coincides with reductions in children's blood levels, which suggests playing around the dirt may be an important source of the toxic for children
