7 Dead Phones → 7,000 mAh Solar Media Server That Runs 24/7 on a Window Sill

Energy needed to make	[e.g., 150 MJ per unit]
Critical earth materials	[e.g., 5g cobalt, 2g lithium]
Energy needed to disassemble	[e.g., 10 kWh for full dismantle]
Energy to procure materials	[e.g., 50 MJ for CRMs procurement]
Total supply chain emissions

Harvest batteries and screens from seven old phones.

Connect batteries in parallel → 25,000–35,000 mAh power bank.

Add Raspberry Pi Zero 2 W ($15).

Mount old phone screens as always-on dashboard.

Stick tiny solar panel on the back.

Result: offline Netflix server that streams to your TV forever without plugging in.

Zero electricity bill.