1) Bard E & Frank M. 2006. Climate change and solar variability: What’s new under the sun? Earth and Planetary Science letters Vol. 248 issue 1-2. pp. 1-14.

2) IPCC, 2007, Fourth Assessment Report, Working Group I Report “The Physical Science Basis”, Chapter 2: Changes in Atmospheric Constituents and in Radiative Forcing, Frequently Asked Question 2.1, How do Human Activities Contribute to Climate Change and How do They Compare with Natural Influences? Figure 2. https://www.ipcc.ch/report/ar4/wg1/

3) Lockwood M & Fröhlich C. 2007. Recent oppositely directed trends in solar climate forcings and the global mean surface air temperature. Proceedings of the Royal Society A. http://rspa.royalsocietypublishing.org/content/464/2094/1367

Figure 1: IPCC, 2007, Fourth Assessment Report, Working Group I Report “The Physical Science Basis”, Chapter 2: Changes in Atmospheric Constituents and in Radiative Forcing, Frequently Asked Question 2.1, How do Human Activities Contribute to Climate Change and How do They Compare with Natural Influences? Figure 2. https://www.ipcc.ch/report/ar4/wg1/

Figure 2: Lockwood M & Fröhlich C. 2007. Recent oppositely directed trends in solar climate forcings and the global mean surface air temperature. Proceedings of the Royal Society A. http://rspa.royalsocietypublishing.org/content/464/2094/1367