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Carbon dioxide (chemical formula: CO2) is a chemical compound composed of two oxygen atoms covalently bonded to a single carbon atom. It is a gas at standard temperature and pressure. Carbon dioxide exists in Earth's atmosphere currently at a globally averaged concentration of approximately 385 parts per million by volume.[1] Carbon dioxide is a greenhouse gas as it transmits visible light but absorbs strongly in the infrared and near-infrared. Carbon dioxide is used by plants during photosynthesis to make sugars which may either be consumed again in respiration or used as the raw material to produce polysaccharides such as starch and cellulose, proteins and the wide variety of other organic compounds required for plant growth and development. It is produced during respiration by plants, and by all animals, fungi and microorganisms that depend on living and decaying plants for food, either directly or indirectly. It is, therefore, a major component of the carbon cycle. Carbon dioxide is generated as a by-product of the combustion of fossil fuels or the burning of vegetable matter, among other chemical processes. Over very long time scales (thousands to millions of years), concentrations are influenced by emissions from volcanoes and other geothermal processes such as hot springs and geysers and by the dissolution of carbonates in crustal rocks.

This process increases the efficiency of biofuel by suppressing the formation of carbon dioxide. For this purpose, hydrogen from a carbon free source like nuclear or solar energy is added at the time of gasification. In the traditional methods, the biomass is firstly converted into carbon dioxide, carbon monoxide and hydrogen in the gasification stage. These components are then separated and converted into liquid fuel. The H2CAR methods provides greater efficiency as carbon atoms present in the starting materials are not lost in this process. In the conventional process, usually 60 to 70 percent of the carbon atoms in the starting materials are lost. So this process reduces the wastage. As the formation of carbon dioxide is also suppressed, it prevents the emission of a greenhouse gas into the atmosphere. The volume of biofuel produced is also three times that produced from the biomass using conventional methods. Researchers are now trying to use these methods to produce fuel that can drive all the automobiles. In the new future, biofuel will be available for use not only in cars and buses, but also in trains and aeroplanes. In times when there is a great scarcity of conventional fuels, this can provide an added benefit by supplying an alternate and also a pollution free source of energy.

Raising biofuel forests in mountain areas will save farmland, make full use of the uninhabited mountains, and increase local people's family income if they are employed to take care of the trees.