Brown clowds that are caused due to pollution are making cities like Beijing,New Delhi darker according to a UN report.These clouds are also melting glaciers in mountain ranges such as the Himalayas faster and turning weather systems more extreme,the UN said.These clouds are caused due to burning of fossil fuels and biomass,the atmospheric brown clouds,made of soot and other manmade particles,are more than 3km thick said a report by UN environment program.
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