[freebeard]

Best use of the unoxidized portion if all the scrap steel would be as armatures for marine electrodepostion.


http://www.impactlab.net/2008/07/18/...utopia-ampere/

Autopia Ampere will begin as a series of wire-mesh armatures anchored atop a sea mountain. Once in place, they will be connected to a supply of low-voltage direct current produced by solar panels. Over time, electrochemical reactions will draw minerals from the sea to the armatures, creating walls of calcium carbonate, which is what us landlubbers commonly call limestone. (See illustration on page 57.) In much the same way that a household sponge absorbs water, the oceans absorb CO2. By removing carbon-containing compounds from the oceans, the mineral accretion process would help reduce the buildup of CO2, which is a greenhouse gas.