Abstract
Within the emerging concept of industrial ecology (IE) that belongs to the research and practical field of sustainable development (SD), the natural ecosystem evolution over time has been described as a metaphor that presents systems of type I, type II and type III ecology. Type I describes a situation when there was little life on earth and plenty of resources. In type II, the ecosystem starts to develop material cycles and energy cascades between organisms and species due to increasing amount of life and emerging scarcity of resources. In type III, the mature ecosystem stage, the system actors have developed nearly completely cyclic flows of matter, energy cascades and diverse interdependencies between them. This paper uses the metaphor in the three systems to develop practical models of type I, II and III industrial ecosystems for an economic system of heating energy and its evolution over time. First, the physical flows of matter and energy are described by using two contrasting case system characteristics, 'throughput' and 'roundput'. Throughput means linear material and energy flows. Roundput means material cycles, energy cascades and sustainable use of renewables, i.e., ecosystem type III. Second, the more structural and organisational features are considered with the characteristic of 'diversity' meaning diversity in resources, human involvement and economic actors and technology used. The case system development over time shown with our practical model of type I–III is radically different from the ecosystem evolution as described in the literature on the industrial ecosystem metaphor of type I–III. This conclusion as a research result, however, is tentative, because of the fuzzy and vague meaning assigned to a metaphor and its confusion with a practical model of industrial development in the industrial ecology literature.
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