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2. https://www.epa.gov/smm/sustainable-materials-management-non-hazardous-materials-and-waste-management-hierarchy.
3. Directive 94/62/EC of the European Parliament and Council Directive of 20 December 1994.
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5. https://journalistsresource.org/wp-content/uploads/2011/11/Report-from-Columbia-Universitys-Earth-Engineering-Center.pdf.