Nobody has shown a scientific basis for how natural cloud variation can account for something of this magnitude. (wattsupwiththat.com)
Even when we have a few natural clouds I see them spray between them trying to get them to connect making bigger clouds in front of the sun. (geoengineeringwatch.org)
Instead they offer a theory that climate change probably derives predominantly from natural ocean - atmosphere oscillations and / or by natural solar variations (irradiation and cosmic ray flux) and / or by natural cloud cover variations and / or the Milankovitch Effect, i.e. it is probably predominantly just natural. (vvattsupwiththat.blogspot.ru)