Title: Factor four
Subtitle: doubling wealth, halving resource use : the new report to the Club of Rome
Subjects: Conservation of natural resources, Economic development, Energy conservation, Power resources, Technological innovations, Industrial productivity, Energieverbruik, Gestion des ressources naturelles, Resssources énergétiques, Vervoer, Economies d'énergies, Grondstoffenbeheer, Environmental protection, Duurzame ontwikkeling, Développement économique, Materiaaltoepassing, Conservation des ressources naturelles