Another problem he cites is the pollution of soil and water in the process -- hydraulic fracturing, or fracking -- which involves injecting large amounts of water, sand and chemicals into shale rock formations at high pressure to force out oil and natural gas.
Drugi problem koji navodi je zagađenje zemljišta i vode, tzv. hidraulično lomljenje, koje podrazumeva ubrizgavanje velikih količina vode, peska i hemikalija u formacije uljanih škriljaca pod velikim pritiskom kako bi se isterala nafta i prirodni gas.