Original sentence: Henrik Svensmark and Eigil Friis-Christensen were the first to suggest (in 1997) a link between galactic cosmic rays and global climate change mediated primarily by variations in the intensity of the solar wind.In June 2007, a paper written by Mike Lockwood of the UK's Rutherford Appleton Laboratory and Claus Froehlich of the World Radiation Center in Switzerland was published in the Proceedings of the Royal Society in June/July 2007.In an interview with LondonBookReview.Svensmark's research downplays the significance to which atmospheric CO2 may affect global warming.Their study concluded that the increase in mean global temperature observed since 1985 correlates so poorly with solar variability, that no type of causal mechanism may be ascribed to it.com, "Chilling Stars" coauthor Nigel Calder responded to the study with the counterclaim that there has actually been no evidence that mean global temperature has risen since 1999
Edited sentence: Henrik Svensmark and Eigil Friis-Christensen were the first to suggest (in 1997) a link between galactic cosmic rays and global warming.However, in June 2007, the ideas of Svensmark and Friis-Christensen were challenged in a paper written by Mike Lockwood of the UK's Rutherford Appleton Laboratory and Claus Froehlich of the World Radiation Center in Switzerland which was published in the Proceedings of the Royal Society in June/July 2007.Svensmark's ideas resonated with current geo-politics and became the basis of much media speculation casting doubt upon the influence of human activity on global climate change.Their study concluded that the link between increased levels of carbon in the atmosphere and global warming was substantially more significant than that between cosmic rays and global warming