Oil is all we seem to want to talk about these days—$3.82 a gallon gas will do that—but the shale gas boom is still going on in much of the U.S. Ground zero—as we wrote about last year in TIME—is Pennsylvania, where some landowners have made a lot of money leasing their land for shale gas production. But as Poppy Harlow reports in this video investigation for CNN, there are environmental problems happening in those same backyard shale gas wells—and many landowners are in the dark about the risk.