Well, lets see... Apart from it also saying It also says: The small problem with this is that no supporting evidence is supplied. In reality, no work that I am aware of has shown that galactic cosmic ray ionisation dominates the tropospheric ionissation and that in turn has a definite effect on clouds. Or in other words, the proposed physical link is no such thing. By the way, did you read the article at the beggining of this thread? Here is a real climate article pointing out that Shavivs work has some major holes in it: http://www.realclimate.org/index.php/archives/2008/03/a-galactic-glitch/#more-534 Finally, what has climate change on the order of millions of years got to do with climate change on the decadal scale? Look at those graphs of Shaviv's- where is there room for the changes of climate on the scale of the last few decades? None of the variation of the last few thousand years shows up, and if you compare the Milankovitch cycles, which are well established as being involved in climate variation, things look more confusing: http://en.wikipedia.org/wiki/Milankovitch_cycles Compare the wikipedia graphs with Shavivs, and see how different they are over the last million years.