Hydraulic fracturing, known as fracking, has made Pennsylvania one of the most productive natural gas producers on the planet.
But how much gas is coming out of the shale and how much money is being made? The state doesn't keep track of it.
Some residents who have leased their land for drilling are filing lawsuits, arguing they’re not being paid fairly.
Marie Cusick of WITF in Harrisburg, Penn., reports.
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