The magic triangle of sustainability
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Ref.: R. Höfer, J. Bigorra, Biomass-based Green Chemistry: Sustainable Solutions for Modern Economies,
Green Chemistry Letters and Reviews,June 2008 , 1,  79-97, adapted from M. Munasinghe, 1992,
Environmental Economics and Sustainable Development, Paper presentedatthe UN Earth Summit, Rio de Janeiro, Environment Paper No.3, World Bank: Washington