Reconstruction of the Earth's surface temperature based on data of deep boreholes, global warming in the last millennium, and long-term solar cyclicity. Part 2. Experimental data analysis

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The effect of the natural factors (solar activity) on the long-term variations of global temperatures has been analyzed based on studying the borehole thermal regime in a time interval of 1000 years ago. It has been indicated that the temperatures started rising about 500 rather than 150 years ago as adherents of the anthropogenic impact on climate consider. The temperature maximum, the amplitude of which is larger than the present-day rise of temperature, is determined about 1000 years ago. The appearance of this maximum corresponds to the time interval of a long-term increase in solar activity according to the data of the 14C and 10Be cosmogenic isotopes. The stabilization of the global temperature in the last decades at a constant increase in the amount of greenhouse gases in the atmosphere contradicts the concept, according to which an increase in the global temperature in the last decades is only explained by the anthropogenic impact.

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