Fracking has been hailed as an energy miracle in the US, yet globally it faces blocks and even bans. Adam Vaughan explains what it is and why it is so controversial
What is fracking?
Hydraulic fracturing, or fracking as it is better known, is a method of extracting oil and gas trapped in shale and other rock formations.
The modern version involves pumping large amounts of water down a well at high pressure, along with sand and chemicals that make up a tiny fraction of the volume. Together, this “stimulation fluid” fractures the rock and releases the gas or oil, which flows to the surface. The hole drilled for a well is about the size of a manhole cover.
Continue reading...from The Guardian http://ift.tt/2ETfLSM
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