A Steady Increase in the Water Footprint at US Fracking Sites (image) American Association for the Advancement of Science Share Print E-Mail Caption These are shale oil wells in the Bakken region, North Dakota. Credit Avner Vengosh Vengosh, PhD, Duke University Usage Restrictions Please cite the owner of the material when publishing. This material may be freely used by reporters as part of news coverage, with proper attribution. Non-reporters must contact Science for permission. 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.