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Vegetable oils are increasingly used as a subsititute for fossil fuels. Vegetable oils are the basis of biodiesel, which can be used like conventional diesel. Some vegetable oil blends are used in unmodified vehicles, but straight vegetable oil needs specially prepared vehicles which have a method of heating the oil to reduce its viscosity and surface tension. Another alternative is vegetable oil refining. The availability of biodiesel around the world is increasing, although still tiny compared to conventional fossil fuel sources. There is significant research in algaculture methods to make biofuel from algae. Concerns have been expressed about growing crops for fuel use rather than food and the environmental impacts of large-scale agriculture and land clearing required to expand the production of vegetable oil for fuel use. These effects/impacts would need to be specifically researched and evaluated, economically and ecologically, and weighed in balance with the proposed benefits of vegetable oil fuel in relation to the use of other fuel sources. == Future of energy for world economy == There is a limited amount of fossil fuel inside the Earth. Since the current world energy resources and consumption is mainly fossil fuels, we are very dependent on them for both transportation and electric power generation. The Hubbert peak theory predicts that oil depletion will result in oil production dropping off in the not too distant future. As time goes on our economy will have to transition to some alternative fuels. Fossil fuels have solved two problems which could be separately solved in the future: the problem of a source of primary energy and of energy storage. Along with straight vegetable oil and biodiesel, some energy technologies that could play an important part in the future include: | width="30%" align="left" valign="top" style="border:0"| * hydrogen economy * methanol fuel * ethanol fuel * lithium economy * zinc-air battery * liquid nitrogen economy * synthetic fuel | width="30%" align="left" valign="top" style="border:0"| * solar energy / photovoltaics * nuclear power (fission power) * fusion power * wind power * compressed air energy storage * flywheel energy storage * biofuel | width="30%" align="left" valign="top" style="border:0"| 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Vegetable oils as alternative energy」の詳細全文を読む スポンサード リンク
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