Half of the infamous Altamont Pass windfarm near San Francisco, in California, will be shut down for four months from 1st November, at the tail-end of the migration season. The annual birdkill at Altamont is almost equivalent to the total number of turbines: 5,400 turbines account for 4,700 bird deaths every year. Now, 2,500 turbines will stand idle for a third of the year as a condition of the ne

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