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Solar or wind could do the cracking of CO2, and maybe this could serve as means for energy storage instead of batteries. But that's not new. What is new is the complication of the preliminary calcium carbonate process (cf. Calera) and the methanol product. I share mrfixitrick's view that the juice is hardly worth the squeeze. Better than this complicated process would be a way to couple this surplus renewable energy directly into the CO2 by shear electrolysis to produce elemental carbon of high value. See http://www.freepatentsonline.com/20090200176.pdf