NOVELTY - The system has a storage medium for storing hydrogen after compression. The storage medium includes high pressure storage tanks and metal hydride storage configurations. A pressure regulation and mixing chamber controls amount of hydrogen released into a final combustion chamber. A mixing chamber mixes hydrogen and oxygen/air, which maintains constant pressure for given environmental conditions. Metal hydride alloys with hydrogen absorption and desorption characteristics drive the compression of hydrogen using a thermally controlled system.    USE - Multi stage hydrogen compression and delivery system (HCDS) for an internal combustion (IC) engine utilizing working fluid and waste heat recovery consists of a thermally driven multi compression stage metal hydride hydrogen compressor in line with a high pressure hydrogen storage tank and a pressure regulating hydrogen delivery system of a vehicle.    ADVANTAGE - The system utilizes hydrogen supplementation in a fuel burning engine and hydrogen storage for a pure hydrogen burning engine, so that the design eliminates transfer of high pressure hydrogen from an off board unit to an on board unit and an on board hydrogen compressor and the storage allow the hydrogen supply at lower initial pressures, thus reducing inconveniences and safety issues associated with high pressure gas transportation and delivery. The system provides integration of the hydrogen compression, storage and delivery to allow commercial, industrial and consumer applications of hydrogen use for reducing the reliance on fossil fuels, so that the mixing chamber design simplifies delivery of the system using simple thermodynamic and gas laws to govern the amounts of gas injected into the engine for optimal combustion conditions and enables fossil fuels to burn faster, thus improving fuel efficiency by the standard fuel burning engine, while simultaneously reducing the emissions from burn in an effective manner.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of a multi stage HCDS-IC with sub-reactors utilizing waste heat and working fluid.