Kirkby, J. et al. 2011. Role of sulphuric acid, ammonia and galactic cosmic rays in atmospheric aerosol nucleation. Nature, 476: 429–433 (25 August 2011) doi:10.1038/nature10343
Jasper Kirkby of CERN and his 62 co-authors, from 17 institutes in Europe and the USA, announce big effects of pions from an accelerator, which simulate the cosmic rays and ionize the air in the experimental chamber. Click here for the letter in Nature. These pions were observed to strongly promote the formation of clusters of sulphuric acid and water molecules. These aerosols are of the kind that may grow into cloud condensation nuclei on which cloud droplets form.
In short: cosmic rays influence cloud seeds….influencing climate. This has BIG implications for climate science.