[toomuchtodo]

I don't see anyone doing this currently on a large enough scale, but I'm hopeful that the crashing costs of renewables, which will push the price of electricity down, will be a catalyst for implementing energy-intensive carbon capture and sequestration methods (currently being experimented with in Iceland).

[jaggederest]

I wish for something like a closed loop cycle: Solar energy into electrolysis to fuel a sabatier process and feed the resulting methane into a syngas-to-gasoline process should be the standard for fuel production in the future. It's energetically expensive, but we'll never run out of water and carbon dioxide.

[cache-monet]

Not exactly a closed loop - about 30-50% of the carbon dioxide we release is absorbed into the ocean[1]. So this process might actually decrease atmospheric CO2 levels, but ocean acidification will continue to increase.

[1] http://www.gdrc.org/oceans/fsheet-02.html

[jaggederest]

Carbonic acid in the ocean is in equilibrium with the atmosphere, so if you knock down the ppm in the atmosphere it'll eventually affect the oceans.

[phire]

It could be a good way of dumping extra load in a renewable national grid.

Spec the grid so that in low supply situations (low wind, low sun) there is enough power to cover actual demand 90% of the time. Then whenever there is extra power, (windy and/or sunny days) you redirect that extra power into carbon capture/sequestration.