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and global supply impacts of materials in our products. as a result, we're prioritizing materials that would benefit from transitioning to recycled or renewable sources first: aluminum, cobalt, copper, glass, gold, lithium, paper, plastics, rare earth elements, steel, tantalum, tin, tungsten, and zinc
aim to make the best products in the world with the highest-quality materials. but sometimes the scrap materials available don't meet our high standards for purity and performance. so we invent new methods to address those issues. like developing a custom aluminum alloy for the enclosures of macbook air...
https://www.apple.com/environment/