The 2012 season will is see a total of six former world champions line-up on the grid, with Raikonnen and Vettel being joined by Mercedes' seven-time winner Michael Schumacher, Ferrari's two-time champion Fernando Alonso and McLaren's championship-winning duo of Jenson Button and Lewis Hamilton.

CNN: Raikkonen returns to F1 with Renault

For instance, homes equipped with solar-power panels could feed unused electricity back into the grid, adding to the total available supply.

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