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The combined effects of human- made atmospheric brown clouds (ABCs) and greenhouse gases in the atmosphere are having broad-based impacts, including causing some cities to get darker, contributing to faster melting of some glaciers, masking the effects of climate change, and having negative effects on agriculture and air quality, according to a 13 November report released by the United Nations Environment Programme (UNEP). “We believe today's report brings ever more clarity to the ABC phenomena and in doing so must trigger an international response, one that tackles the twin threats of greenhouse gases and brown clouds and the unsustainable development that underpins both,” said Veerabhadran Ramanathan, head of the UNEP scientific panel carrying out the research and a professor at the Scripps Institution of Oceanography, La Jolla, Calif. The report, “Atmospheric brown clouds: Regional assessment report with focus on Asia,” can be found at http://www.unep.org.