For example, AR4 WG1 assesses the level of scientific understanding of cloud albedo effects as «low.» (judithcurry.com)
Investigators are least certain of the climatic influence of something called the aerosol cloud albedo effect, in which aerosols from human origins interact with clouds in complex ways and make the clouds brighter, reflecting sunlight back to space. (scientificamerican.com)
``... when you correct Sagan's incorrect optical physics of sols, which started the whole CAGW scare, «cloud albedo effect» cooling changes to heating, another AGW which is self - limiting.» (realclimate.org)