The document discusses strategic principles of infrastructure focusing on eco-efficiency. It defines eco-efficiency as maximizing the sustainable use of renewable resources and increasing product or service value for customer satisfaction. Specifically, it recommends maximizing the use of renewable resources like solar power and biomass to reduce pressure on finite resources. It also suggests focusing on product durability through robust designs and materials to decrease waste and resource use from frequent replacements. Finally, it recommends maximizing the service intensity of goods and services through shared use, multifunctionality, and easy upgrading to create more customer value while reducing environmental impacts.