The US's National Academy of Engineering estimates that on a global basis, 80 % of commercial products are discarded after a single use, and that the remaining 20 % are not used as long as they could be.
美國國家工程技術學院更估計，全球有 80 % 的商品在使用過一次後就被丟棄，而另外的 20 % 也沒有得到它們該有的生命週期。