Atmospheric brown clouds (ABCs) are widespread layers of brownish haze of air pollutants, such as aerosol particles (black carbon (BC) and non BC), and precursor gases (e.g. CH4, CO, NMVOCs, NOx), which produce aerosols and ozone. ABCs and their interaction with build-up of greenhouse gases significantly affect the regional climate, hydrological cycle, glacial melting, agriculture production, ecosystem and human health.
The United Nations Environment Programme (UNEP) commissioned Atmospheric Brown Cloud (ABC) Programme in 2002 with a team of renowned scientists. ABC programme is addressing the issue of ABCs through measurements, impact assessment, demonstration of mitigation solutions, and creating awareness to underpin the issue at the policy forums. More than 200 scientists are working on ABCs, generating a wealth of science-based knowledge on sources, evidences of significant impacts, and demonstration of mitigation solutions.
ABC programme promote science-policy interface by engaging and providing a common platform to scientists, academia, researchers, students, government and non-government organizations, and international agencies. The objectives of science-policy interface are to create awareness and transfer the science-based knowledge to policy makers so that they can incorporate the knowledge in the policy making process.
ABC helped to develop consensus and effectiveness of available emission reduction technologies. Many governments have responded positively and developed national programmes or supporting national efforts to reduce the emissions of ABCs. ABC programme has also helped to place the ABCs issue in the international agenda.
More infotmaion on ABC activities....