Atmospheric Brown Clouds: Regional Assessment Report with Focus on Asia (summary) was the first integrated assessment report on ABCs with focus on Asia. It disussed the impacts of ABCs on regional climate, water resources, precipitation, agriculture production, glacier melting, and health. It reveals that the ABCs is a global phenomenon, spread heterogeneously over several parts of the world. The ABCs with build-up of greenhouse gases (GHGs) resulting a global warming and possessing major environmental threats to Asia’s water and food security. ABCs have resulted surface dimming, atmospheric solar heating and melting of the Hindu Kush-Himalayan-Tibetan (HKHT) glaciers and snow packs due to deposition of soot.