River Itchen in Hampshire (image) Queen Mary, University of London Caption The clear waters of chalk rivers sustain a diverse range of protected animals and plants. Researchers from Queen Mary University of London were surprised to find that naturally high concentrations of the greenhouse gas methane contributes to energy production in chalk rivers in a new study. Credit Queen Mary University of London Usage Restrictions Please credit Queen Mary University of London when using the photo 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.