 It chronicles examples of 75 percent or greater resource productivity at zero-to-negative cost, and suggests principles to help replicate those successes.Simultaneously, Heinz co-founded in 1995 the first U.S. office of The Natural Step, a Sweden-based nonprofit organization specialized in education and consulting around sustainable development.In 1999, after receiving a masters in environmental management at the Yale School of Forestry and Environmental Studies, where he specialized in industrial environmental management and industrial ecology, Heinz accepted a job offer to run the international office of The Natural Step in Stockholm.