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Open thread for climate solution discussion. Climate science discussions should remain on the Unforced Variations thread.

Open thread for climate solution discussion. Climate science discussions should remain on the Unforced Variations thread. It will be much, much more economic to make methane and diesel fuel from electricity and carbon dioxide and store them in existing storage tanks than it would be to build pumped storage. It takes roughly 43 kWh (154.8 MJ) to electrolyze 1 kg of H2 from water.  It takes 0.5 kg of H2 to make 1 kg of methane from CO2 by the Sabatier reaction: The lower heating value of methane is 50.0 MJ/kg, so you get less than 2/3 of your 77.4 MJ back as fuel.  But it gets worse!  If you burn that methane in a CCGT at 60% efficiency you only get 30 MJ of electricity back out.  That’s less than 40% round-trip efficiency… and you haven’t accounted for the energy required to capture the CO2.  If your EROI of wind power is 15:1, the losses in e-gas reduce this to less than 6:1 BEFORE accounting for the energy cost of the e-gas system. It’s nonsense like this which proves that “Green” schemes are the refuge of the innumerate.  Oh, and Mark Z. Jacobson is a fraud, as proven by numerous analyses including by Clack et al. In 2018 PNNL demonstrated cost-effective absorption mining of ...