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- plastics (5)
- plastic marine debris (4)
- refuse and refuse disposal (4)
- plastic scrap (3)
- recycling (waste, etc.) (3)
- chemical plants (1)
- environmental ethics (1)
- environmental protection (1)
- hazardous waste site remediation (1)
- hazardous waste sites (1)
- love canal chemical waste landfill (niagara falls, n.y.) (1)
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- sustainable living (1)
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