- David Whitehouse – Sunspots reaching 1,000-year high – BBC News 06/07/2004 – http://news.bbc.co.uk/2/hi/science/nature/3869753.stm
“Over the past few hundred years, there has been a steady increase in the numbers of sunspots, a trend that has accelerated in the past century, just at the time when the Earth has been getting warmer. The data suggests that changing solar activity is influencing in some way the global climate causing the world to get warmer.” - I.G. Usoskin et al (2004) – Solar Activity in the Last 1150 Years. Does it correlate with climate? – Proceeding of the 13th Cool Stars Workshop – 5-9/07/2004 – Hamburg – http://www.mps.mpg.de/dokumente/publikationen/solanki/c153.pdf – Peer reviewed
“During these last 30 years the solar total irradiance, solar UV irradiance and cosmic ray flux has not shown any significant secular trend, so that at least this most recent warming episode must have another source.» - Mike Lockwood (2008) – Recent changes in solar outputs and the global mean surface temperature. III. Analysis of contributions to global mean air surface temperature rise – Proceedings of the Royal Society A 464:1387–1404 doi: 10.1098/rspa.2007.0348 – Published online 10/03/2008 – http://rspa.royalsocietypublishing.org/content/464/2094/1387.abstract – Peer reviewed
“It is shown that the contribution of solar variability to the temperature trend since 1987 is small and downward; the best estimate is −1.3% and the 2σ confidence level sets the uncertainty range of −0.7 to −1.9%. The result is the same if one quantifies the solar variation using galactic cosmic ray fluxes (for which the analysis can be extended back to 1953) or the most accurate total solar irradiance data composite.”
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