In July 2004, the London Telegraph reported on a study by Swiss and German scientists suggesting increased radiation from the sun – not human activity – was to blame for climate changes.

"The sun is in a changed state," said Dr. Sami Solanki of the Max Planck Institute for Solar System Research in Gottingen, Germany. "It is brighter than it was a few hundred years ago and this brightening started relatively recently – in the last 100 to 150 years."