Nobody has shown a scientific basis for how natural cloud variation can account for something of this magnitude. (wattsupwiththat.com)
Given the massive effect fossil fuel consumption has had on the sulphur cycle and the accompanying addition of SOx NOx and other chemicals to the atmosphere there may be a source of MUCH greater influence on cloud variations, over the timescale of human fossil fuel use and in synchrony with the CO2 changes. (judithcurry.com)
analysis of low - cloud variations in the present climate has the potential to lead to improvements in the representation of the (climate-dynamics.org)