More than half the world’s forests fragmented in 20 years

“If you can imagine walking into a huge, 1,000-kilometer square [386-square-mile] tropical forest … it’s moist and damp [with] rich soil and an overstory. You imagine walking into a 10-meter [33-foot] patch of forest and it’s just a totally different thing. It’s drier, it’s more open, it’s more harsh, and there’ll be far fewer species,” says Thomas Crowther, ecology professor at the Swiss Federal Institute of Technology Zurich (ETH Zurich). Fragmentation, the process by which large areas of intact forest become broken up into smaller pieces, is increasing in most of the world’s forests, according to a new Science study authored by Crowther and other researchers at institutions in Switzerland, Australia, China, the U.S. and the UK.   The study finds that more than 50% of the world’s forests