Air pollution: thirty million tons of methane - a gas that contributes to global warning - comes from manure in sewage ponds or heaps.
空气污染三千万公吨的沼气一种助长全球温室效应的气体，便是来自于畜牧场的废水或堆肥。
These flying robots could be fitted with air sniffing or sampling technology to test air quality, search for pollution or give early warning about biological or gas attacks.
这些飞行机器人也可用于空气嗅探或取样，以检测空气质量，寻找污染，在生物或毒气袭击前发出预警。
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