Combined estimates from the Organisation for Economic Co-operation and Development (OECD), the United Nations Office on Drugs and Crime (UNODC), UNEP and INTERPOL place the monetary value of all environmental crime – which includes logging, poaching and trafficking of a wide range of animals, illegal fisheries, illegal mining and dumping of toxic waste – at between US$70 and US$213 billion each year. This compares to global Overseas Development Assistance of around US$135 billion.
See here the UNEP original source and the complete news: http://www.unep.org/newscentre/default.aspx?DocumentID=2791&ArticleID=10906&l=en