Pat Popple, a leader of Concerned Chippewa Citizens, discusses her concerns over frac sand mining at her home in Chippewa Falls, Wis., on Dec. 15, 2011. Sand from the soft sandstone under the bluffs and hills of parts of Wisconsin and Minnesota is highly sought after by drilling companies that use it to unlock underground natural gas and oil supplies in a controversial practice called hydraulic fracturing, or fracking. But Popple and other activists in the scenic region are fighting back, fearing the upsurge in sand mining carries risks to human health and other negative consequences. (AP Photo/Steve Karnowski)
Read the article: Frac sand from Minnesota-Wisconsin border bluffs assists natural gas, oil boom in N.D., elsewhere
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