Refining iron or aluminum from ore takes significant energy because you're basically un-rusting it, and that reaction naturally runs the other way; recycled metal gets to reuse that energy investment.
I thought the glass process was basically melting sand and adding some trace additives, rather than forcing any chemical reactions uphill. Recycled glass also needs melted (if it doesn't, that's called a reusable bottle, not recycling).
I thought the glass process was basically melting sand and adding some trace additives, rather than forcing any chemical reactions uphill. Recycled glass also needs melted (if it doesn't, that's called a reusable bottle, not recycling).