More Environmental Rules Needed for Hydrofracking (image) Stanford University Share Print E-Mail Caption A hydraulic fracturing operation under way in western Pennsylvania. Credit Mark Zoback, Stanford University Usage Restrictions Graphics, photographs and videos provided by the Stanford University are to be used - with appropriate credit - for editorial purposes only. Flopping, altering or otherwise embellishing these images in any way that changes the editorial content of the images is prohibited. Permission is for one-time use only. Supplied image file must be deleted after use. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.