Regarding the laptop. I realise full well how the supply chain produces CO2, but that’s exactly the point I’m trying to make. In my opinion it’s not the use of energy that’s the problem. Energy generation might be, depending on mode of generation.

Concrete buildings are not the problem, coal being burned in kilns is the problem. I find this distinction really important. By focusing on the wrong thing we’re going to come up with the wrong solutions. Such as banning concrete. Or banning Bitcoin mining.