A new study has revealed that small lakes on Earth have expanded considerably over the last four decades – a worrying development, considering the amount of greenhouse gases freshwater reservoirs emit. Between 1984 and 2019, global lake surfaces increased in size by more than 46,000 square kilometers (17,761 square miles), researchers say. That's slightly more than the area covered by Denmark. Carbon dioxide, methane, nitrous oxide, and other gasses are constantly produced from lakes, because of the bacteria and fungi feeding at the bottom of the water, snacking on dead plants and animals that have drifted down to the lake...