Henrik Svensmark's documentary on climate change and cosmic rays.
Updated below with MUST READ comments from Piers Corbyn Climate Change has nothing to do with Cosmic rays!
Although Svensmark is a good scientist and a good guy his theory does not work. It fails basic observational tests - namely that world temperatures should follow the 11 year cycle in Cosmic Rays as modulated by solar activity, but they do not. As he says charged particles are key but observations show the ones that matter are not Cosmic Rays.
By far the largest signal other than annual variations is the magnetic cycle of the sun - 22yrs - which governs key aspects of solar particle (NOT Cosmic rays) connectivity with Earth; see one of the longest running posts on CR (3rd in all time most read):-