Stephen Hawking*: I would like nuclear fusion to become a practical power source. It would provide an inexhaustible supply of energy, without pollution or global warming.
In nuclear fusion, atoms are forcibly joined, releasing energy. It is, say scientists, the "holy grail" of energy production - completely clean and cheap.**
source: http://en.wikipedia.org/wiki/Nuclear_fusion
http://www.time.com/time/magazine/article/0,9171,2029483,00.html
*http://en.wikipedia.org/wiki/Stephen_Hawking"
**http://www.bbc.co.uk/news/10385853
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