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Devastating tropical storms of the kind that battered the US last week could be weakened and rendered less deadly using a simple and cheap technology based on a surprising component – old car tyres.
One of Britain's leading marine engineers, Stephen Salter, emeritus professor of engineering design at Edinburgh university and a global pioneer of wave power research, has patented with Microsoft billionaires Bill Gates and Nathan Myhrvold the idea of using thousands of tyres lashed together to support giant plastic tubes which extend 100m deep into the ocean.
Wave action on the ocean surface would force warm surface water down into the deeper ocean. If non-return valves were used, he says, the result would be to mix the waters and cool the surface temperature of the ocean to under 26.5C, the critical temperature at which hurricanes form.
According to Salter, who has written to the government's chief scientific officer setting out his scheme, harnessing energy from the waves to cool the surface temperature of the ocean makes ecological sense. The naturally working pumps would be located in "hurricane alley", the warm corridor in the Atlantic through which the most damaging storms typically develop and pass.
Salter claims that the hydrological problems have been solved but that research funding is urgently needed. "If you can cool the sea surface, you would calm the hurricanes. I estimate you would need about 150-450 of these structures. They would drift around and send out radar signals so that no one would collide with them," he said.
Hurricane suppression ideas go back more than 100 years but attempts have mostly proved tragicomic, said Jim Fleming, author of a new history of geo-engineering. Ideas have included setting up rows of cannon on the Florida coast to shoot them down; using laser beams from space; and "seeding" them with silver iodide.
The results have proved at best uncertain. One hurricane "manipulated" by the US government in the 1940s veered off course and struck Georgia, causing $20m of damage and killing two people. In 1962, just after the Cuban missile crisis, Fidel Castro complained that the US had "modified" a hurricane which, remarkably, lingered over the island for four days after exercising a U-turn.
Many countries, including the US and Russia, have tried to militarise weather research, trying to divert hurricanes and storms into the path of their enemies.