National Public Radio: Neighborhood organizations across the U.S. that want to improve the environment are using a surprising weapon: seed balls. It’s a technique for planting in abandoned places and often inhospitable land that was developed in Japan by Masanobu Fukuoka, a pioneer in “natural farming.” The technique has worked its way to Brooklyn, N.Y. In the Greenpoint neighborhood on a recent Sunday afternoon, a small group of activists walked the streets carrying paper bags filed with little …