Fracking has only recently become a household word, but government involvement with the drilling technique goes back decades. President Obama haschampioned the potential of natural gas drilling combined with more regulation. While there has been mounting evidence of water contamination, few regulations have been implemented. The graphic below traces officials' moves -- and levels of caution -- over time.
Follow the link to follow the chart: http://www.propublica.org/special/from-gung-ho-to-uh-oh-charting-the-governments-moves-on-fracking