TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The step of providing the carbon dioxide (CO2)-rich capture material involves: capturing CO2 by contacting a CO2-containing gas and a CO2 capture material to produce a CO2-rich capture material. The CO2-deplete capture material is recycled to the capture step and used as the CO2 capture material. The step of providing a metal oxide involves reacting metal in an oxidizing environment to produce the metal oxide. The CO2-deplete capture material is recycled to the capture step via the oxidizing step and used as the CO2 capture material. The metal of the release step is recycled to the oxidizing step and re-oxidized. The metal is recycled to the oxidizing step via the capture step. The metal is present in the capture step and the CO2-rich capture material and metal is passed through the oxidizing step of reacting metal in an oxidizing environment to produce a metal oxide. Preferred Components: The CO2 capture material is CaO (preferably CaO supported on MgO). The metal is Cu.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Apparatus: The capture reactor is in fluid communication with the oxidizing reactor. The release reactor is further in communication with capture reactor for the passage to the capture reactor from the release reactor of the CO2-deplete capture material and metal and the release reactor is further in communication with the oxidizing reactor for the passage to the release reactor of CO2-rich capture material and metal oxide from the capture reactor. The release reactor is further in communication with the oxidizing reactor for the passage to the oxidizing reactor of CO2-deplete capture material and metal from the release reactor and the release reactor is further in communication with the capture reactor for the passage to the release reactor of the CO2-rich capture material and metal oxide from the capture reactor.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The fuel is methane. EXAMPLE - No suitable example given