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The answer is already in the question. The Fossil energy sources are LIMITED. We have to find/explore/invent/developed or whatever new energy sources. Biofuels are the possible answer to this challenge. At the moment, in big amount, there are no alternative of them as substitute material whitout changing our already existing wehicals.
Biofuels are produced from biomass which renewable, so these energy sources are renewable contrary to fossil energy.
Of course there are other ways for replacing fossil fuels but most of them requires new technology wehicles as well.
And also, we do not have to forget about the GHG emission. It is a very argumentative topic, but still important.
So this is my oppinion about the present role of biofuels.
