Lake Greening Threatens Water Supplies And Accelerates Climate Change (image) University of Minnesota Share Print E-Mail Caption July 10, 2014. Water flowing into a eutrophic lake from agricultural fields. Algae is already abundant in the stream where it has grown due to high nutrients and temperatures. The background shows rich and productive agricultural lands. Credit John A. Downing/Minnesota Sea Grant. Usage Restrictions None 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.