BBC News - Great Walls of America 'could stop tornadoes': "The barriers - 300m (980ft) high and up to 100 miles long - would act like hill ranges, softening winds before twisters can form.
They would cost $16bn (£9.6bn) to build but save billions of dollars of damage each year, said Prof Rongjia Tao, of Temple University, Philadelphia."
'via Blog this'
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