The Intergovernmental Panel on Climate Change (IPCC) is in the process of preparing its next major report (called AR5 for short) to be published next year. The IPCC has been a strong proponent of human-cause global warming via our carbon dioxide emissions from burning fossil fuels. The IPCC has always downplayed solar forcing saying that total solar irradiance (TSI) is too weak to make much of a difference. In that respect, they have a point. However, the IPCC has always ignored the other, stronger major solar variation, that of the sun’s changing magnetic field which controls the amount of cloud-forming galactic cosmic rays (GCR) reaching our atmosphere.
I reported last year on the CERN experiment which reconfirmed that cosmic rays have a strong influence on cloud formation and hence on climate. In the newly leaked draft report, the IPCC now admits to the “existence of an amplifying mechanism such as the hypothesized GCR-cloud link.”
You can read the whole story about the leaks and their implications at Anthony Watts’ “Watts Up With That”(WUWT) blog here.
The IPCC authors “are admitting strong evidence (“many empirical relationships”) for enhanced solar forcing (forcing beyond total solar irradiance, or TSI), even if they don’t know what the mechanism is.” This directly undercuts the case for anthropogenic global warming.
Refer to WUWT for updates on this breaking story.