In a 2007 report, the U.N. climate change panel said such geo-engineering options were largely speculative and unproven, with the risk of unknown side effects. Reliable cost estimates had not been published, it said.
"The price is not a major factor... it's peanuts," said Crutzen. "The cost has been estimated by some at 10, 20 million U.S. dollars a year."
(Editing by Kevin Liffey)
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