Citizen scientists help in University of Bonn study showing river carries up to 4,700 tonnes of ‘macrolitter’ annuallyThousands of tonnes of litter is pouring into the North Sea via the Rhine every year, poisoning the waters with heavy metals, microplastics and other chemicals, research has found.This litter can be detrimental to the environment and human health: tyres, for example, contain zinc and other heavy metals that can be toxic to ecosystems in high concentrations. Continue reading...