Press Trust of India: Brown clouds of pollution are hanging over Asia, making “cities from Beijing to New Delhi” darker, melting glaciers in ranges like the Himalayas faster and turning weather systems more extreme, the UN said on Thursday. Formed as a result of burning of fossil fuels and biomass, the Atmospheric Brown Clouds (ABCs), made of soot and other manmade particles, are more than three km-thick, said a new report by the UN Environment Programme (UNEP). The layer that stretches from the …