[t14n]

https://www.cell.com/patterns/fulltext/S2666-3899(21)00188-4

> We stress that this estimate carries some uncertainty but gives us a reasonable idea of the impact of ICT. Across studies, roughly 23% of ICT's [information and communication technologies] total footprint is from embodied emissions, yet the share of embodied emissions for user devices specifically is ca. 50%. This is because, unlike networks and data centers, user devices are only used for parts of the day and use less electricity, but are exchanged often, especially in the case of smartphones.

"embodied emissions" being emissions generated from manufacturing.

older blog discussing data from older devices and electronics:

https://www.lowtechmagazine.com/2009/06/embodied-energy-of-d...