1. Cisco Annual Internet Report 2018–2023. White Paper
https://www.cisco.com/c/en/us/solutions/collateral/executive-perspectives/annual-internet-report/white-paper-c11-741490.html
2. Global E-Waste Monitor
https://www.itu.int/en/ITU-D/Environment/Pages/Spotlight/Global-Ewaste-Monitor-2020.aspx
3. State of IoT 2021: Number of Connected IoT Devices Growing 9% to Billion Globally, Cellular IoT Now Surpassing 2 Billion
https://iotanalytics.com/number-connected-iotdevices/
4. Soaring E-Waste Affects the Health of Millions of Children
https://www.who.int/news/item/15-06-2021-soaring-e-waste-affects-the-health-of-millions-of-children-who-warns
5. All the Metals We Mine Each Year, in One Visualization. World Economic Forum
https://www.weforum.org/agenda/2021/10/all-tonnes-metals-ores-mined-in-one-year/