Thousands of abandoned mines in Pennsylvania are full of polluted water. Now the natural gas boom is helping pay to clean up that water so it can be used for fracking to produce more gas. Reid Frazier reports.

Natural gas is booming in the United States but many are concerned about the safety of extraction. A new AP investigation studied complaints of groundwater contamination from fracking, and reporter Kevin Begos tells host Steve Curwood all about it.

A tiny minnow called the Oregon Chub was put on the Endangered Species List more than 20 years ago. But the Chub has rebounded, and now officials want to make it the first fish ever taken off the Endangered Species List because of population recovery. Cassandra Profita reports.

In a bid to avoid some of the worst effects of climate change some scientists are advocating possible strategies to artificially alter the climate. But critics warn of unforeseen and dangerous consequences of any atmosphere altering intervention. David Keith from Harvard University and Clive Hamilton of Charles Sturt University in Australia debate the case for each side with host Steve Curwood.

Elizabeth Kolbert’s new book, The Sixth Extinction, explores the many ways humans are helping cause the largest extinction event since an asteroid wiped out the dinosaurs. Elizabeth Kolbert discusses what's happening with host Steve Curwood.