salon: Already, Reuters reports, 14 different weed species in the U.S. have developed resistance to glyphosate — the world’s most widely used herbicide – affecting some 60 million acres of farmland and causing an estimated $1 billion per year in damages. The drastically reduced efficacy of the herbicide lead to the USDA’s approval, last fall, of a... - http://silas216.tumblr.com/post...