As demonstrated by the Garbage Project's research into landfills, the bulk of American landfills are comprised of:

Question

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The Garbage Project's research into landfills found that the bulk of American landfills are comprised of paper, not plastics, construction materials, or aluminum. This is because paper products are widely used and often not recycled, leading to a significant accumulation in landfills.

As Demonstrated by the Garbage Project's Research into Landfills, the Bulk