Researchers have developed a hybrid sodiumcarbon dioxide fuel cell that eliminates  carbon dioxideand produces electricity and hydrogen. The technology, developed at South Korea’s Ulsan National Institute of Science and Technology (UNIST) and Georgia Institute of Technology, depends on a well-understood phenomenon: the dissolution of carbon dioxide into water to produce an acidic solution, which occurs in nature when carbon dioxide dissolves in the oceans. If acidity increases, the number of protons increases, which in turn increases the power to attract electrons. The battery system based on this phenomenon produces electricity by removing CO2.