Where to fix nitrogen pollution: 20 opportunities (image) University of Vermont Share Print E-Mail Caption A new study reveals the 20 best places to tackle U.S. farm nitrogen pollution. Credit University of Vermont Usage Restrictions In conjunction with reportage of U.S. nitrogen issues, and with credit to the University of Vermont. 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.