the ihdp is supported by the united nations and numerous international associations while developing ways to steer industrial societies in developeddeveloping countries towards sustainability the ihdpit group published a simplified booklet ihdpit which provided a conceptual basis analytical tool evaluation procedure and policy implication methods to reduce our ecological rucksack hidden flows and improve factor x and resource efficiency in corporations regions eg ecotowns and national initiatives some studies have also suggested a double decoupling for sustaining resource use economic growth from resource use resource efficiency and resource use from environmental impact bringezu