Last night, on the U.S. cable television program 'The Rachel Maddow Show', a report was given on the effects of fracking, as noted in a report and a documentary titled 'Fracking the Eagle Ford Shale: Big Oil & Bad Air on the Texas Prairie'. Here are the two segments related to this report.
The link below will take you to the page of the report Rachel Maddow highlights. There is a lot there: video, reports, click-on graphics, etc. You will find it highly informative.