The solar energy can be harvested in the form of biomass through the use of waste material and by growing energy crops (petrocrops). It can also be harvested through the use of microorganisms, which can convert solar energy into chemical energy in the form of molecules like glycerol (from salt, H2O, and CO2) and hydrogen (from H2O).
These energy sources are renewable and offer less polluting alternatives, since petroleum consumption and also production of varied organic substances by fermentation (this leads to production of CH4 and CO2) lead to environment pollution.
These aspects make an important component of biotechnology programmes there are several other aspects of energy, including conservation of energy and energy technology policy, which are important for a complete discussion on energy.
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