Printer-friendlyEmail to friend

A Feb. 7 article begins:

"Fracking has only recently become a household word, but government involvement with the drilling technique goes back decades. President Obama has championed the potential of natural gas drilling combined with more regulation. While there has been mounting evidence of water contamination, few regulations have been implemented."

A graphic produced by ProPublica traces officials' moves -- and levels of caution -- over time.

See the graphic