INTRODUCCION HUELLA DE CARBONO

NUESTRA HUELLA ECOLOGICA

12th mayo 2009

NUESTRA HUELLA ECOLOGICA

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http://books.google.com.co/books?id=ljpRXhe5pygC&pg=PP1&dq=William+Rees+y+Mathis+Wackernagel#PPA50,M1

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