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Its combustion does not produce greenhouse gases, ozone layer depleting chemicals, acid rain ingredients, and finally environmental pollution.Being a renewable energy carrier, hydrogen has a high specific heat of combustion. It is possible to use hydrogen in internal combustion engines to generate mechanical power or in fuel cells to generate electricity.
As hydrogen can be produced from many natural sources, it is expected to have a stable price in the future, independent of the fluctuation in price and availability of single sources.
Hydrogen is a synthetic fuel and it should be manufactured.
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Energy supply, climate change, and global food security are among the main chalenges facing humanity in the twenty-first century.
There are various methods to manufacture hydrogen: direct thermal, thermochemical, electrochemical, biological methods, etc.
Among these, biological methods have the potential of providing the most cost effective hydrogen.Despite global energy demand is continuing to increase, the availability of low cost energy is decreasing.Together with the urgent problem of climate change due to CO release from the combustion of fossil fuels, there is a strong requirement of developing the clean and renewable energy system for the hydrogen production.It is obvious that fossil fuels (i.e., petroleum, natural gas and coal) while being rapidly depleted meet most of the world’s energy demand today.Their utilization, however, causes global warming, climate change, ozone layer depletion, acid rain, and pollution, all of which are pose great dangers for the environment of our planet Earth.An economy and transport infrastructure based on molecular hydrogen and fuel cells could decrease our dependence on oil and the concomitant environmental consequences.Positively affecting the energy security, such approach would mitigate air pollution and global climate change.Due to this fact, many research groups around the world work on biological hydrogen production.Nowadays, it is important to develop renewable and clean energy sources for the future.Secondly, burning of H production in green algae, cyanobacteria and higher plants are based on photosynthesis.Human life existed in past and exists today due to the photosynthesis.