Instead, one of the electrodes dipped into the calcium chloride is made of solid titanium dioxide.

ECONOMIST: Dr Chen and the philosopher��s stone

Past attempts, however, have relied on dissolving the tetrachloride (or sometimes the dioxide) into the molten calcium chloride.

ECONOMIST: Dr Chen and the philosopher��s stone

For the electrolysis of titanium dioxide, the preferred electrolyte is molten calcium chloride.

ECONOMIST: Dr Chen and the philosopher��s stone

This dissolves carbon dioxide and hides it away on the ocean floor as calcium carbonate.

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It has developed a method to extract carbon dioxide from industrial emissions and bubble it through seawater to create calcium carbonate, a process that mimics the buildup of coral.

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Geological history shows that anthozoans secrete their calcium carbonate skeletons more slowly during periods when there is a lot of carbon dioxide in the atmosphere.

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