Nasa Earth Observatory

By studying 71 lakes in 33 countries from space, researchers from Stanford University have found that toxic algal blooms in freshwater have been increasing since the 1980s. Using satellite data from the past 30 years, they found blooms were becoming more frequent in 70 per cent of the lakes studied, but that this wasn’t linked to usual causes, such as fertiliser use or rainfall changes. The lakes that had fewer blooms over time, however, had warmed less than other lakes.