Science

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EmbedVideo(7877, 514, 320); In an unlikely alliance, natural gas companies and environmentalists have decided to work together to make fracking safer. Rick Karr travels to Pennsylvania to explore the tensions this has created among environmental groups.

.embed-container { position: relative; padding-bottom: 2.25%; padding-top: 30px; height: 0; overflow: hidden; max-width: 100%; height: auto; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; } When the winter months fall…