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On this week's show:

Drilling for oil and gas creates waste that can contain heavy metals and radioactivity, and much of it is sent to the same landfills as our household trash. An investigation into how contamination from shale drilling waste can move from landfills into waterways without much oversight. Treating drinking water to prevent lead contamination might have the unintended consequence of higher phosphorus levels in urban waterways. Researchers are working to figure out the balance between how much carbon forests emit and how much they absorb.

The Pennsylvania Department of Environmental Protection has reached a $3.3 million agreement over decades-old contamination at a petroleum storage facility in Pittsburgh. U.S. Steel has agreed to pay a fine in a settlement with the Pennsylvania Department of Environmental Protection for pollution in the Monongahela River. The Trump administration has reversed course again on a new air pollution rule for coke oven plants. Older adults who live in southcentral Pennsylvania have higher rates of melanoma skin cancer, according to a study by Penn State researchers. Sign up for our newsletter! Get our newsletter every Tuesday morning so you'll never miss an environmental story.