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Scientist Discover How to Convert CO2 into Powder That Can Be Stored for Decades
(www.scientificamerican.com)
This is a most excellent place for technology news and articles.
These articles always avoid answering questions like that and are never detailed enough to inform you. I read this as, without the facts to support it, their process is similarly efficient to others, but yields a more stable end product. If the process scales, it will be more suitable for long term storage than previous attempts