Farmers around the world have come to depend on manufactured inorganic fertilizers containing key plant nutrients phosphorus, nitrogen and potassium to enhance soil fertility, especially in the otherwise poor soils of most tropical settings. But while all three are relatively abundant in nature, commercially viable sources of phosphorus to make these fertilizers could be exhausted just a few decades from now. That prospect, which remains a source of heated debate, has spurred a drive to recover the significant quantities of this element that disappear in the waste streams of cities and farms.
Some 705,000 tons of fishing gear are lost or discarded in the ocean every year, and each year this gear captures and kills, among other things, an estimated 136,000 seals, sea lions and whales. A few companies and harbor masters are taking steps to address that.
From acres of sheeting to miles of twine, farms use billions of pounds of plastic each year. What can we do to reduce the impact?