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Campaigners have criticised plans for a sea trial of cloud-whitening technology, funded by Microsoft founder Bill Gates.
A US-based research body, Silver Lining, which has received $300,000 from Mr Gates, is developing machines to convert seawater into microscopic particles to be sprayed into clouds. Scientists believe this will increase the whiteness, or albedo, of clouds and increase their ability to reflect more sunlight back into space, reducing global warming.
The Gates-backed sea trial would be the largest known attempt to geoengineer the climate so far, reported to be conducted over an area of 10,000km2.
However, campaigners say such a large-scale trial is 'risky' and that a global ban on geoengineering experiments should be put in place until regulations governing the sector can be introduced.
'We knew Microsoft was developing cloud applications for computers but we didn't expect this. Bill Gates and his cloud-wrenching cronies have no right to unilaterally change our seas and skies in this way,' said Jim Thomas from Canadian environmental campaigners,
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