Mongabay: Nitrogen pollution of the world’s oceans is harming marine ecosystems and contributing to global warming, report two reviews published in the journal Science. The research, which involved dozens of scientists from around the world, shows that human activity is dramatically altering nitrogen cycles in Earth’s oceans, soils, and atmosphere. The papers report that agricultural runoff and the burning of fossil fuels have boosted the supply of reactive nitrogen in the open oceans 50 …