The Sun as climate driver is repeatedly discussed in the literature but proofs are often weak. In order to elucidate the solar influence, we have used a large number of temperature proxies worldwide to construct a global temperature mean G7 over the last 2000 years. The Fourier spectrum of G7 shows the strongest components as ~1000-, ~460-, and ~190 - year periods whereas other cycles of the individual proxies are considerably weaker. The G7 temperature extrema coincide with the Roman, medieval, and present optima as well as the well-known minimum of AD 1450 during the Little Ice Age. We note that the temperature increase of the late 19th and 20th century is represented by the harmonic temperature representation, and thus is of pure multiperiodic nature. It can be expected that the periodicity of G7, lasting 2000 years so far, will persist also for the foreseeable future. It predicts a temperature drop from present to AD 2050, a slight rise from 2050 to 2130, and a further drop from AD 2130 to 2200. --Horst-Joachim Lüdecke and Carl-Otto Weiss, The Open Atmospheric Science Journal (11) 2017.
Retired climatologist Prof. Werner Kirstein: CO2 is “a harmless gas.” "When I go back and look at history, there’s absolutely no relationship between CO2 and temperature.” IPCC is about marketing. The IPCC is fundamentally corrupt.” “Today you do not find scientists on the IPCC, instead you have political scientists.”