VANCOUVER, Wash. - A new study in Global Biogeochemical Cycles shows per-area greenhouse gas emissions from the world's water reservoirs are around 29% higher than suggested by previous studies, but that practical measures could be taken to help reduce that impact. Much of the increase in emissions comes from previously unaccounted for methane degassing, a process where methane passes through a dam and bubbles up downstream, according to the analysis by Washington State University and University of Quebec at Montreal scientists. Overall, the researchers found the world's water reservoirs are annually producing methane, carbon dioxide, and other greenhouses gases in an amount roughly equivalent to 1.07 gigatons of carbon dioxide.