Filthy birds


Urine from seabirds is a major source of ammonia in the atmosphere, damaging local plants and contributing to acid rain. Sarah Wanless of the British government’s Centre for Ecology and Hydrology at Banchory in Scotland has found ammonia concentrations in the air near seabird colonies that are 20 times as high as those typically found around chicken factory farms. Factory farms were previously thought to be the main source of ammonia in the atmosphere,
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