Subject
- Clean Air Act[remove]6
- Earth Day2
- Environmental Protection Agency2
- Adirondack Mountains (N.Y.)1
- Coal-burning power plants1
- Disasters1
- Environmental education1
- Environmental protection--California1
- Metal Recycling1
- Polymer science and technology1
- Recycling & reusing1
- Recycling centers1
- Shad1
- Union of Concerned Scientists1
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