Question: Select the example of an upstream process in the waste stream. In clothing production, colored dyes generate unusable wastewater. In copper extraction, smelting produces slag,

Select the example of an "upstream" process in the waste stream.
In clothing production, colored dyes generate unusable wastewater.
In copper extraction, smelting produces slag, an unwanted by-product.
In distribution, packing peanuts protect goods during transportation.
All of these are correct.
 Select the example of an "upstream" process in the waste stream.

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