The Fracking Debate

We're discussing environmental ethics in my class this week.  One issue that I find fascinating (and to be a good model for how to think about other environmental issues) has to do with hydraulic fracturing ("fracking"). It's difficult to find reliable, unbiased material online dealing with the environmental/moral issues related to fracking.  Here is a song critical of the drilling process.  And here's the trailer for Gassland, a documentary/film from 2010 that is similarly critical of fracking. Of course, there are those that contend that fracking isn't so problematic. For example, see this interview on reason.tv. What do you think about fracking?  Is this a morally acceptable way to extract natural gas?  What argument(s) do you find most compelling?