For a metal to qualify as equal friendly it should require as little energy for extraction as possible. For example, aluminum would not be eco-friendly because it requires energy to refine and separate it from the minerals in which it’s found. You also want to consider fuel used in transportation. If you’re importing metal from the other side of the world, that’s expending energy. For me, living in Chile, copper is the most eco-friendly metal. It’s local, it’s highly durable (so you’ll reduce waste because you won’t have to replace it as often) and it’s also one of the most easily recyclable and most frequently recycled metals.
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