Edited by Robert U. Ayres and Leslie W. Ayres
Chapter 12: Industrial ecology and life cycle assessment
12. Industrial ecology and life cycle assessment Helias A. Udo de Haes Life cycle assessment can be regarded as part of industrial ecology, which is a science that studies the interaction between society and its environment. In this ﬁeld quite diﬀerent approaches present themselves. First of all a distinction can be made between studies which are performed in physical terms and studies which are performed in monetary terms. Studies in physical terms have their historical roots in the 19th century and go back to Marx and Engels. These authors used the term ‘metabolism’ (Stoﬀwechsel) to imply a material relation between man and nature, a mutual interdependence beyond the widespread simple idea of man utilizing nature (cf. Fischer-Kowalski 1998). Studies in monetary terms may take the environment into account as physical extensions of monetary models, like input–output analysis as developed in the 1980s (Leontief 1986), or they may even address the environmental consequences of economic activities in monetary terms, as in cost–beneﬁt analysis. The present chapter only includes studies of the society–environment relationship in physical terms. In this ﬁeld of physical relationships a further distinction can be made regarding diﬀerent types of object. Thus environmental risk assessment (ERA) has its focus on the assessment of environmental impacts of single activities like the functioning of a factory, or of single substances. In fact ERA studies start with the emissions and do not really consider the processes in the economy which precede them. Then there are...
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