NOVELTY - Producing a composition comprising cyanoguanidine, comprises using a source of energy to react a metal oxide with a source of carbon to produce a finely divided metal carbide at an elevated temperature and immediately reacting the hot finely divided metal carbide with nitrogen gas to form a metal cyanamide.    USE - The methods are useful for producing composition comprising cyanoguanidine which is useful in urea, urea containing fertilizer, cyanamide-based transportation fuel (all claimed) e.g. car and boat, chemical industry e.g. paper and textile manufacturing and load-levelling electric power grids.    ADVANTAGE - The method provides: the composition which has a high specific energy and energy density and low toxicity, and can be environmentally friendly and easy to handle; the cyanoguanidine and cyanamide which have high ammonia content; and the metal cyanamide with good yield.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) providing the composition, comprising: using a source of energy to separate hydrogen from water; reacting the hydrogen with carbon dioxide to form carbon and water; reacting a portion of the carbon with calcium oxide to form calcium carbide; reacting the calcium carbide with a nitrogen to form a composition containing calcium cyanamide; further processing the composition containing calcium cyanamide to form the composition;    (2) producing urea from cyanoguanidine, comprising producing the cyanoguanidine, hydrolysis of the cyanoguanidine to produce ammonia and carbon dioxide, and combination of the ammonia and carbon dioxide to produce ammonium carbamate, and reaction of the ammonium carbamate to produce urea;    (3) producing a urea-containing fertilizer from cyanoguanidine, comprising producing the cyanoguanidine, partial hydrolysis of the cyanoguanidine to produce a composition containing at least one of cyanoguanidine, guanylurea, guanidine, urea, ammonia or carbon dioxide, separating the gaseous components from the above composition and providing the composition for use as a fertilizer;    (4) an apparatus for producing the composition, comprising: (a) a reactor with a first section containing an electric arc and adapted for introducing calcium oxide and a carbon source to form compositions containing calcium carbide in a finely divided state; (b) a second section where the hot product from step (a) is contacted with nitrogen to form a composition containing calcium cyanamide; and (c) a third section for collecting and cooling the calcium cyanamide composition; and 1    (5) producing a cyanamide-based transportation fuel comprising: (a1) producing urea; (b1) heating the urea with magnesium oxide or magnesium dioxide or magnesium carbonate or a mixture of these oxygen-containing magnesium compounds at a molar ratio of urea to magnesium compound is 1:1-4:1 at 130-200 degrees C until it is substantially melted; (c1) transferring the molten material to a device where it is heated to 230-400 degrees C with continuous mixing or tumbling or kneading action until a solid is formed; (d1) calcining this solid, which contains magnesium cyanamide, at 600-900 degrees C; (e1) reacting this magnesium cyanamide with water and carbon dioxide to form cyanamide and magnesium carbonate; (f1) separating the cyanamide from the magnesium carbonate; and (g1) heating the magnesium carbonate above 500 degrees C to recover the magnesium oxide if magnesium oxide or magnesium hydroxide are used for step (b1) or powdering the magnesium carbonate to a grain size of 1-200 mu m if the carbonate is used in step (b1).