The German branch of the international climate group Greenpeace on Wednesday said levels of microplastics have doubled in the Rhine river since 2020. In a new study, the organization measured samples of river water taken between the western cities of Cologne and Dusseldorf. It found an average of 1.1 new microplastic particles per cubic metre, with particularly high concentrations around the Dormagen chemical park. The figure is around twice as high as Greenpeace found in its first survey of the Rhine in 2020. In late 2021, the number of microplastic particles in the river stood at 0.63 per cu…