Maybe it's time for the "net" in Net Zero to go. Direct air capture (of CO2 from the atmosphere) of 10 gigatonnes of CO2 per year (IPCC aim by 2050), has a *theoretical minimum* energy cost of 10% of the world's current energy consumption. And in practice it currently takes 5-7 times more than that, so >HALF our entire electricity supply. That energy would be far better spent decarbonising, until that task is complete. The aim has to be **zero** carbon, not net anything. #climate #CDR #NetZero