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Fuels of the Future for Renewable Energy Sources (Ammonia, Biofuels, Hydrogen)

Potential strategies for the development and large-scale application of renewable energy sources aimed at reducing the usage of carbon-based fossil fuels are assessed here, especially in the event of the abandonment of such fuels. The aim is to aid the initiative to reduce the harmful effects of carbon-based fossil fuels on the environment and ensure a reduction in greenhouse gases and sustainability of natural resources. Small-scale renewable energy application for heating, cooling, and electricity generation in households and commercial buildings are already underway around the world. Hydrogen (H2) and ammonia (NH3), which are presently produced using fossil fuels, already have significant applications in society and industry, and are therefore good candidates for large-scale production through the use of renewable energy sources. This will help to reduce the greenhouse gas emissions appreciably around the world. While the first-generation biofuels production using food crops may not be suitable for long-range fuel production, due to competition with the food supply, the 2nd, 3rd and 4th generation biofuels have the potential to produce large, worldwide supplies of fuels. Production of advanced biofuels will not increase the emission of greenhouse gases, and the ammonia produced through the use of renewable energy resources will serve as fertilizer for biofuels production. The perspective of renewable energy sources, such as technology status, economics, overall environmental benefits, obstacles for commercialization, relative competitiveness of various renewable energy sources, etc., are also discussed whenever applicable.