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To understand the natural causes of the ?global warming?, it?s necessary to know the temporal evolution of the warm and cold phases of some cosmic phenomena with a cyclical development that induced the general climate of our planet in the past. For historic times, the climatic effects of shorter cycles are manifested more than those of longer ones, which are less visible. Thus, the ?global warming? (in fact the ?Actual Climatic Optimum? - ACO) can be regarded as the last warm phase of the mini-glaciations cycle. T...