11. The Earth's carrying capacity is a central issue in ecological economics . 12. He is a founding member and past-president of the International Society for Ecological Economics . 13. The work was criticized by articles in " Ecological Economics " 14. In ecological economics , it is argued that labor is in fact energy over time. 15. It is closely related with ecological economics , but has a more politically applied focus. 16. His research is in the fields of environmental economics, ecological economics and sustainability science. 17. His work contributed significantly to thermoeconomics and to ecological economics . 18. One striking example is this section of an article on environmental and ecological economics . 19. He is a foremost practitioner of ecological economics , defining many of its key concepts approaches. 20. Ecological economics emphasizes the flow of matter and energy among socioeconomic systems and their environment.
