Networks could use far less energy by 2020 even though they'll be carrying much more traffic, an industry group says. The GreenTouch consortium, formed in 2010 to speed up progress on more efficient networks, says it has identified technologies that together could cut network power needs by 90 percent even in the face of rapidly growing data demand. The group of equipment vendors, component makers and service providers will present that conclusion in a report due in mid-June.