Lake Saimaa in Finland (IMAGE) University of Eastern Finland Caption Shorter and warmer winters lead to an increase in emissions of methane from northern lakes. Credit Kristiina Martikainen Usage Restrictions Please mention the photo credit. License Licensed content 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.