Some extra ideas:
http://news.bbc.co.uk/1/hi/business/8085551.stm
http://news.bbc.co.uk/1/hi/sci/tech/8055344.stm
http://news.bbc.co.uk/1/hi/sci/tech/8078938.stm
http://seattletimes.nwsource.com/html/nationworld/2008700362_lithium03.html
http://www.guardian.co.uk/environment/2009/may/14/air-powered-car-hybrid-france
http://news.bbc.co.uk/1/hi/sci/tech/7243247.stm
Enjoy!
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