On May 4, workers dismantle the charred remains of a house in Firestone, Colo., where an unrefined gas line leak explosion killed two people in April. Brennan Linsley/AP hide caption
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old wells
A contractor prepares to cut off the top of a coal bed methane well near Gillette, Wyo., in 2015. It's one of thousands of abandoned, plugged wells sprinkled throughout Wyoming and Colorado. Stephanie Joyce/Wyoming Public Media hide caption