Last year the Global E-waste Monitor was published, it is one of the most important document when it comes to facts surrounding e-waste. The report is done in collaboration between the Global E-waste Statistics Partnership (GESP), formed by UN University (UNU), the International Telecommunication Union (ITU), and the International Solid Waste Association (ISWA), in close collaboration with the UN Environment Programme (UNEP), the World Health Organization (WHO) and the German Ministry of Economic Cooperation and Development (BMZ).
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A short summary as well as the complete report can be read at http://ewastemonitor.info/