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Transportation
Public Companies
Nissan
Why: Mainstream use of electric cars could benefit the environment, especially where power is produced relatively cleanly.
Key innovation: Nissan's new electric car, the Leaf, has a reasonably modest sticker price of $32,000.
Toyota
Why: Hybrid cars can significantly reduce gasoline consumption by using an electric motor alongside a gasoline engine.
Key innovation: A market leader with its Prius model, it is developing battery technologies that are helping to make these cars less expensive and more energy-efficient.