Penn State researchers have found a possible solution to the problem of storing alternative energy. It's a bacterium able to convert electricity into methane gas when combined with CO2.
The Cleantechnica blog reports that: "Any surplus power from wind, solar, or tidal sources is fed into thebacteria and combined with CO2 from the atmosphere to create methanefor storage. Methane is a clean-burning gas and 80% of energy fed intothe process was retained at the end."
Might this also deal with some excess CO2?