> What matters is the source of the electricity that is consumed. It is key to distinguish between renewable sources of electricity and fossil fuels. We do this by taking into account the total electricity mix of each country to convert Bitcoin’s electricity consumption into its carbon footprint.

Jumps out to me as being not particularly precise. In the US, for instance, you need to take a much more local view- bit coin mining tends to be clustered near hydro power. This pulls the opposite way with coal plants in the boonies of China.