This week we begin a new series, Hazardous to Your Health. We'll visit two communities near Pittsburgh--each with a history of industrial pollution. And we'll talk with the people who live there about how their attitudes toward nearby Coke plants--and their emissions--are changing.

In this episode, we follow the natural gas pipeline and float down the Ohio River to bring you some of our favorite award-winning stories from the last year. Plus, President Trump promised to build a big, beautiful wall, but the cost might be greater for biodiversity than the price tag indicates.

This week on the Allegheny Front, monarch butterflies are in big trouble. What can we do to help them? Plus there's pushback as nuclear energy struggles to stay relevant. Also some kids are so fed up with the President and Congress failing to act on climate change that they are suing. And finally, the world waits while Trump decides whether to break the U.S. commitment to the Paris climate agreement.