"PCBs (Printed Circuit Boards) are guilty too – recyclability is incredibly low (and very expensive) and they do not decompose. Why can’t use a biodegradable material instead of silicon?"
PCBs are NOT made of silicon. Integrated circuits are (but not their packages). PCBs are usually FR-4 material:
PCBs are NOT made of silicon. Integrated circuits are (but not their packages). PCBs are usually FR-4 material:
https://en.wikipedia.org/wiki/Printed_circuit_board