参考来源：
[1]Here's why your AirPods battery life is getting worse, and what you can do about it. William Gallagher. https://appleinsider.com/articles/19/03/11/heres-why-your-airpods-battery-life-is-getting-worse-and-what-you-can-do-about-it
[2]Your AirPods Will Die Soon . ALANA SEMUELS. https://www.theatlantic.com/technology/archive/2019/03/your-airpods-probably-have-terrible-battery-life/585439/
[3]The explosive problem with recycling iPads, iPhones and other gadgets: They literally catch fire. Geoffrey A. Fowler. https://www.washingtonpost.com/technology/2018/09/11/explosive-problem-with-recycling-ipads-iphones-other-gadgets-they-literally-catch-fire/
[4]Urgent Need to Prepare Developing Countries for Surge in E-wastes: UN. https://unu.edu/media-relations/releases/urgent-need-to-prepare-developing-countries-for-surge-in-e-wastes-un.html
[5]Apple cracks down further on cobalt supplier in Congo as child labor persists. Todd C. Frankel. https://www.washingtonpost.com/news/the-switch/wp/2017/03/03/apple-cracks-down-further-on-cobalt-supplier-in-congo-as-child-labor-persists/?noredirect=on&utm_term=.f36209929318
[6]https://www.reportsanddata.com/report-detail/lithium-ion-battery-market