Close window Published online: 1 August 2007; | doi:10.1038/news070730-6 Brown clouds boost global warmingAerosols over Asia incriminated in Himalayan glacial melting.Daniel Cressey Clouds of pollution sit over southern Asia for half the year.NASA/GODDARD SPACE FLIGHT CENTER/J. SCHMALTZ Tiny particles of pollution may be causing as much warming as greenhouse gases over southern Asia. The clouds of aerosol particles are contributing to the potentially devastating melting of Himalayan glaciers, say researchers. Using data from unmanned aircraft flying through 'brown clouds' of aerosol pollution over the Indian Ocean, US researchers found the zone of the atmosphere containing the clouds is warming...