NOVELTY - A hydrocarbon containing formation is treated in situ by providing heat from heat source(s) to at least a portion of the formation, allowing the heat to transfer from the heat source to a selected section of the formation, controlling the heat so that an average temperature within the selected section is less than 375 degrees C, and producing a mixture from the formation.    USE - For in situ treatment of hydrocarbon containing formation (e.g. a formation containing coal, oil shale, and/or heavy hydrocarbons) to produce hydrocarbons, hydrogen and/or novel product streams. It may also be used to produce synthesis gas, which may be converted to heavier condensable hydrocarbons, or combusted as fuel, e.g. methanol, gasoline, or methane. The synthesis gas may also be used as feed gas for production of ammonia and urea that is used to produce fertilizer. A steam may also be generated from the formation used for heating another portion of the formation, generating synthesis gas, generating electricity, and/or as a steam flood in an oil reservoir (all claimed).    ADVANTAGE - The invention economically produces high quality hydrocarbons, hydrogens, and/or other products. It increases the production of selected formation fluids, inhibits the production of less desirable products, and increases the uniformity of permeability within the formation.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (a) A system configured to heat a hydrocarbon containing formation comprising a heater, an oxidizing fluid source, and a conduit;    (b) A mixture produced from a portion of a hydrocarbon containing formation comprising an olefin content of less than 10 wt.%, and an average carbon number of less than 35;    (c) A method for in situ production of synthesis gas from a hydrocarbon containing formation comprising heating a section of the formation to a temperature sufficient to allow synthesis gas generation, providing synthesis gas generating fluid to the section, and removing synthesis gas from the formation;    (d) A method of sequestering carbon dioxide within a hydrocarbon containing formation comprising heating a portion of the formation to increase permeability and form uniform permeability within the portion, allowing the portion to cool, and storing carbon dioxide within the portion; and    (e) A method for producing ammonia using a carbon containing formation comprising separating air to produce an oxygen rich stream and a nitrogen (N2) rich stream, producing synthesis gas comprising hydrogen (H2) and carbon monoxide from the formation, providing H2 in the synthesis gas and N2 to an ammonia synthesis process, and using ammonia synthesis process to generate ammonia.