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Re:Lithium battery costs have fallen by 98% in three decades by ben_w on Sunday April 04, 2021 @07:19AM (#26688534)
Thanks! While this does not fully change your conclusion for air-capture CO₂, I am confused by this:

> 1 tonne of CO2 gives ~137 kg of methane at 100% reaction yield, due to the molar weight ratio of CO2 to CH4.

I think it’s more like 363 kg given the ratio of molar weights: http://www.wolframalpha.com/input/?i=co2%20molar%20weight%2F...

(Looks like an extra factor of two, but I can’t figure out why, everything I play with in WolframAlpha is a factor of two in the wrong direction)

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