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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.
Here is the paper the article is based on
It is very chemistry dense that is way overy head. It says that "typical" electrolysis techniques have around a 10% "carbon efficiency", whatever that means, while this one has around 96%.
I also see that in their test they used CO2 gas, so this may efficiently get us a usable fuel from CO2 but may not help us sequester CO2 gas from the atmosphere.
I'd love someone who knows what they are talking about to analyze it for us though.