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This article was published in 2001 and gives information on various outlets of alternative energy. It does not suggest a need for a switch or give information on sustainability.
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This article studies the benefits of using alternative fuels in developing countries in 2003. It suggests that the benefits of alternative energy outweigh the negatives.
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This article was published in 2009 and talks about the need to stimulate advancements in the knowledge and usage of alternative fuels.
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This article was published in 2012 and shows the realization that fossil fuels are not sustainable, and it suggests methods to get away from them.