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1. Using Cu2O and/or CdSe as catalysts, it's possible to split water into hydrogen and oxygen via sunlight. The hydrogen is stored, the oxygen is released into the atmosphere.
2. Using a ruthenium-catalyst, it's possible to combine the hydrogen with carbondioxide into formic acid. Extract the formic acid.
3. Formic acid is a liquid. Transport it.
4. Using the same ruthenium-catalyst, it's possible to split the formic acid into hydrogen and carbondioxide.
5. Burn the hydrogen with oxygen from the air. The exhaust fume is water-vapour.
Losses: The sunlight from step 1 and the electricity to keep the industrial processes running.
http://www.nature.com/ncomms/2014/140602/ncomms5017/full/ncomms5017.html
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