Carbon sequestration is the term given to a suite of technologies that can remove CO2 from large point sources, such as power plants, oil refineries and industrial processes, or from the air itself. The CO2 can then be stored in geologic formations such as depleted oil and gas reservoirs, deep coal seams or saline reservoirs. It can also be stored in plants, trees and soils by increasing their natural CO2 uptake. Because carbon sequestration holds the potential both to reduce emissions of CO2 from point sources and to remove CO2 from the air, sequestration research has grown over the last five years from small-scale, largely conceptual studies, to one of the highest single technology priorities. >.