I hadn't read this when I posted earlier but they had a sub-chapter on "waste and scrap".
After China joined the wto (World Trade organization) in 2001, the value of U.S. "waste" and scrap to China increased 15x from 740 million in 2000 to 11.5 billion (non-adjusted for inflation) in 2011.
Out of the top 10 non-manufactured U.S. exports to China in 2009, #s 4-7 were scrap & waste: ferrous waste & scrap--2.51 billion, paper waste & scrpa--1.57 billion, Cu waste & scrap--1.36 billion, and Al waste & scrap--1.26 billion.
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