Should researchers pay more attention to ‘river litter’ issues in your country ?

Marine litter pollution is quite notorious among environmentalists and fair promoted on social media but what do we know about ‘river litter' ?! Rivers , streams and its tributaries in the proximity of settlements ( urban or rural) are far more vulnerable to illegal dumping than other environmental factors. Such bad practices are encountered in low, middle and even high income countries due to the lack , improper or inefficient waste management systems. Can you suggest papers , projects or organizations which are implied in this field ?