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Abstract
A number of significant facts of observation concerning the fluctuations of world climate during geological, historical and observational time are summarized, and their significance with regards to the primary factors of climatic control are noted. The principal theories which are currently accepted to account for the fluctuations of world climate between glacial and interglacial extremes are scrutinized as to their adequacy or inadequacy in satisfying the known facts about climatic fluctuations. The advantages of the solar variability hypothesis are emphasized, particularly of the irregular solar variability of the variety which characterizes the sunspot cycle. Certain evidence is presented as to the influence of the irregular solar disturbances on the current weather patterns in a manner similar to the climatic fluctuations of the past.