Natural gas is harvested from saturated shoal rocks in abundant supply nationwide via drilling. The main challenge with natural gas is transporting and storing it to prevent leakage. There has been some controversy over natural gas, specifically in New York and Pennsylvania, due to the hydrofracture method of extracting it from shale. The process uses a high pressure mixture of water, sand and other substances to crack the shale. There are concerns that the process releases pollutants into reservoirs. To operate water at pressures of 4200 psi, the engine of a hydrofracturing rig supplies 100 to 175 horsepower. The main concern with natural gas extraction is not the energy used in extracting it, but the emissions from the hydrofracture process.
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