Biochar made from corn cobs can remove microplastics and ammonia from water, offering a low-cost, reusable filter made from farm waste.

Corn cob biochar made from farm waste can remove up to two thirds of ammonia and almost all micro and nanoplastics from water, while avoiding the release of toxic byproducts and remaining reusable ...

It’s hard to green the desert. Take China, or Africa’s Sahel region, for example. Their “Great Green Walls,” grand projects to beat back encroaching desert by planting trees, have required decades of ...