The Cloud Mystery is a documentary by Danish director Lars Oxfeldt Mortensen.
It explores the theory[1] by Danish scientist Henrik Svensmark on how galactic cosmic rays and solar activity affects cloud cover, and how this influences the Earth's climate.
Danish engineering trade weekly Ingenøren found that the documentary gave a sober overview of Henrik Svensmarks theory, though it lacked scientific criticism.
[3] The documentary sparked a debate between supporters of the scientific consensus that carbon dioxide is the prime cause of global warming, and opponents.
[4][5] However, the scientific results of Svensmark and Nir Shaviv, two of the protagonists, forming the basis of the documentary, have been criticized by Mike Lockwood and Claus Froehlich (see Galactic Cosmic Rays vs Global Temperature).