An nameless reader quotes a file from Ars Technica: A brand new learn about led by way of the University of California, Santa Cruz’s Greg Rau highlights any other instrument for our CO2 elimination toolbox: splitting seawater to produce hydrogen gas for fuel while capturing CO2 with ocean chemistry. In electrolysis, a tool powered by way of electrical energy is used to separate H2O, generating hydrogen fuel. Several chemical changes to this procedure had been proposed that may additionally seize CO2 from the environment. Like the concept of the use of biofuels, this represents a “win-win” by way of generating an power useful resource whilst taking pictures CO2, bringing the value down. [T]he gist is that atmospheric CO2 is going into the ocean as bicarbonate — which would possibly not acidify the water or hurt ecosystems. So should you energy the electrolysis procedure with renewable power, you’ll flip sun/wind/hydroelectric power into hydrogen gas whilst additionally eliminating CO2 from the air.
The new learn about makes a speciality of a elementary estimate of the value and most attainable of this method. First, the researchers labored out its potency of CO2 seize — about zero.three lots captured in step with gigajoule of electrical energy enter, together with the losses from quarrying and crushing rock. That’s round 10 instances more than biofuel schemes, nevertheless it will depend on the assumption that there’s call for for all the hydrogen gas you’re making. The hydrogen can be utilized by way of automobiles, and there may be the risk of the use of hydrogen as one of those garage for the electrical grid — the use of extra energy to make hydrogen that may run an influence plant when wanted. So it is not too farfetched that call for may just upward push to satisfy provide. The researchers’ back-of-the-envelope estimate places the value of the program at between $three and $161 in step with ton of captured CO2, relying on which form of renewable power powers it. The learn about has been published in the journal Nature Climate Change.