Fracking CAP

I read an article that talked about how the US now supplys 10% of the worlds oil. What has helped to make us grow this to 10%? Fracking is the reason we are able to reach all this oil that otherwise would be untouched. The one problem with fracking is that it is very controversial. People think that it will eventually move up through the rock and conttaminate our water. What do you all think of fracking? Do you think it should be banned even though it contributes to about 4.3 percent of what we produce? 

http://www.climatecentral.org/news/tight-with-oil-u.s.-crude-10-percent-of-global-supply-17238