The mysterious collapse of honey-bee colonies is becoming a global phenomenon, scientists working for the United Nations have revealed ... The report lists a number of factors which may be coming together to cause the decline and they include ... Air pollution, which may be interfering with the ability of bees to find flowering plants and thus food – scents that could travel more than 800 metres in the 1800s now reach less than 200 metres from a plant." (Quoted from article)