One billion people can get electricity for the first time for little more than the cost of one month's war in Iraq, said Rajendra Pachauri, the head of a Nobel peace prize-winning UN panel of climate scientists.
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Pachauri compared the $15 billion cost of providing solar-powered lights to a billion people with a reported cost of the US-led military campaign in Iraq of $12 billion a month.
He described that perceived mis-match in resources as "one of the biggest tragedies that the world can be guilty of".