Extracting natural gas from the Earth is not as simple as drilling with a very long Black&Decker. Oil can be extracted like that, but natural gas hides between soil and rocks under heavy pressure. Thousands of little pockets near by each have to be broken to extract the gas. So the big problem is: How we break all these rocks hundreds of meters underneath the surface?
Well, the answer that scientists have found is called "fracking" and involves injecting millions of gallons of chemically-treated water. How this works? Why chemicals have to be added? And what are the dangers behind all this? Watch the following video...
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