CBC: Carbon dioxide stored in water can erupt back into the atmosphere through natural vents such as the Chaffin Ranch geyser in Utah. (Jason Heath/Nature) Carbon dioxide stored underground in nature eventually ends up mainly in fizzy water, not rocks — and that could have implications for artificial carbon capture and storage projects. A new study by British, Canadian and U.S. researchers, published in Thursday’s edition of Nature, sheds some light on the conditions that allow …