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Warming and Cooling of The Earth’s Climate and Their Causes

Abstract The progressing warming of the Earth’s climate is mainly caused by natural factors, that is, the increasing solar activity and the decreasing volcanic activity on the Earth. The aspects which testify to the predominance of natural factors include: synchronous changes in the average air temperature in the Northern Hemisphere in the years 1856-2002, the average consecutive 11-year Wolf numbers and the location of the mass centres of the four largest planets. Natural causes of the climate warming are corroborated by the synchronicity of changes in the carbon dioxide concentration and paleotemperature in the last 450,000 years, revealed on the basis of an analysis of the ice core in Antarctica. Periods of climate warming occur every 100,000 years and are caused by an increased solar radiation in high latitudes, resulting from changes in the Earth’s orbit and the inclination of the Earth axis (according to the popular Milankovič theory).