Geoengineering takes off

Could an 'artificial volcano' be a fall-back to the world's climate change woes? Let the experimenting begin.

Photo: Richard Hoblitt for the US Geological Survey
Mount Pinatubo exploded in the Philippines in 1991. It put enough sulphur dioxide in the upper atmosphere to lower the average global temperature by half a degree C.
Gwynne Dyer
Published: Thursday, 09/22/2011 12:00 am EDT

Scientists who are working on various concepts for "geo-engineering" the climate are almost comically eager to stress that they are not trying to come up with a substitute for reducing carbon dioxide emissions, the main cause of man-made global warming. They are just researching back-up systems that we might need if the reductions don't happen fast enough.

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