Gręžinių šuliniai prastai hermetizuojami plienu ir betonu, tas hermetizavimas suyra per ilgesnį laiką, todėl niekas nežino, kiek mes maksimaliai iš jų gauname to metano.Žinome tik galimą minimumą, ir tas jau didelis.
1. "The
methane that is created or that escapes from using natural gas as an
energy source represents 23 percent. Other sources include coal beds and
landfills. The Environmental Protection Agency estimate puts the amount
of methane released from drilling and transporting natural gas at eight million metric tons a year, but recent reports suggest the figure could be far larger.
Anthony
R. Ingraffea, a researcher at Cornell University who has been sharply
critical of fracking, said that the gas industry had been lax in what it
calls “wellbore integrity,” which refers to the steel and cement that
drillers use to seal off wells from the surrounding rock, soil and
groundwater. The seal tends to deteriorate over time, he said, and abandoned wells have been found to leak methane,
as well. “Out of the four or five million wells drilled on earth,
nobody knows how many of them are leaking into the atmosphere, or how
much they are leaking,” he said."
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