TECHNOLOGY FOCUS - BIOLOGY - Preferred Components: The methanogenic microorganism is indigenous to the subterranean formation. The methanogenic microorganism is a member of Methanobacteriales, Methanomicrobiales, Methanscoccales, Methanosarcmales or Methanopyrales.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: In method (M1), the natural source of hydrogen indigenously produced is available in the subterranean formation. The subterranean formation contains a basic or ultrabasic rock (preferably kimberlites). The aqueous solution is added to adjust pH of 3-12; temperature of the formation is adjusted to less than 125 degrees C; pressure of the formation is adjusted to less than 10000 psig; and salt concentration in the formation is adjusted to less than about 300,000 parts per million (ppm). In method (M1), phosphorus, nitrogen, potassium, cobalt and/or nickel are added. The method (M1) further involves recovering methane; fracturing the subterranean formation to maintain or improve permeability and porosity; and selecting the subterranean formation such that carbon dioxide may also be sequestered as magnesite and/or calcite. In method (M2), hydrogen is produced by decomposition of water. The formation environment is modified to promote natural hydrogen generation. The step (f) involves determining an ecological environment that inhibits or retards in situ microbial degradation of methane by methanotrophic microorganisms of the consortium; and step (g) involves modifying the environment to inhibit or retard in situ microbial consumption of hydrogen by organisms other than methanogens. The methane recovered is used to fuel a process in which carbon dioxide is produced, and produced carbon dioxide is then recycled to the formation. In method (M3), the mineral rich solution or tailings are from a mine operation, mined kimberlite, and/or reactive rock. The surface reactor comprises a clay lined pit. The surface reactor comprises a surface tank. The method (M3) further involves adding a mineral rich solution or igneous rock mine tailings to the surface reactor and recovering the methane.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The metabolic conversion of carbon dioxide to methane is promoted by addition of at least one nutrients, vitamins, trace elements, buffers, organic acids, an aqueous solution to adjust salinity and/or pH, and complexing agents. EXAMPLE - No suitable example given.