Fracking's contamination of drinking water in Texas and Pennsylvania was due to [ leaky cement in frack wells ]( http://www.theguardian.com/environment/2014/sep/15/drinking-water-contaminated-by-shale-gas-boom-in-texas-and-pennslyvania-study ) , a study finds.
Ссылка: https://stallman.org/archives/2014-jul-oct.html#16_September_2014_%28Frack_wells_contaminate_drinking_water%29