From Physorg.com, a study of river systems from across the US looks as how these systems filter nitrogen. How it’s done is by denitrogenzing bacteria taking nitrates from the water and creating nitrogen gas. And the amount of nitrates in the water is related to the amount made into gas. This relates to algal blooms that is harmful to humans and create dead zones in the ocean.

International Rivers, a NGO, is having action for rivers, today and tomorrow.