1. Her academic focus is ecological economics , sustainable precautionary economics and eco-social modernization. 2. Specific types of sustainability include, sustainable agriculture, sustainable architecture or ecological economics . 3. Much of her work has focused on complex systems Ecological Economics ". 4. Multiple global ecological economic initiatives are being promoted to solve this problem. 5. Much of Rees'work is in the realm of ecological economics and human ecology. 6. Ecological economics promotes preserving natural capital with emphasis on sustainability and sustainable development.7. Mathematical modeling is a powerful tool that is used in ecological economic analysis. 8. He is closely associated with theories of a Ecological Economics ". 9. Ecological Economics , Volume 69, Issue 10, 15 August 2010, Pages 1904-1917.10. Non-governmental organizations, such as the Institute of Ecological Economics , also play a role.