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Traditional non-renewable fossil fuels are still relatively cheap to produce but environmentally expensive. New renewable energy is, by contrast, still expensive to generate but environmentally sound. The debate surrounding the restructuring of energy supplies is a highly complex geopolitical debate. So how will the world economy be powered by the end of the 21st century?

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Staring down the barrel Oil faces an uncertain future in the 21st century. It is expensive, environmentally damaging and, in the view of some experts, increasingly scarce.	Energy, the smarter way Europe is leading the way in the search to provide new electricity networks fit for the 21st century. SmartGrids points to a more energy efficient future.
Iceland fuel protests Angry truck drivers have been leading protests in Iceland over the rising cost of fuel. This week, the demonstrations became violent, as a viewer's iReport shows.	More stories A necessary evil? Calculating the cost Hedging their bets Valuing the rainforests RSS feed: Economics of Energy