Vodafone UK, Capgemini and other firms plan to cut employee flights by 20 percent within the next five years, according to WWF

, an environmental organization. WWF's "One in Five Challenge" is an "independently audited" program that encourages videoconferencing and rail options as alternatives to air travel, provides participants "a toolkit to help plan and implement a greener business travel policy," and includes "annual evaluation of the money and carbon saved."