This paper discusses the causes of present-day climate changes, obtained at S. I. Vavilov State Optical Institute in recent years. The main conclusions relate to the relationship of the contribution of natural sources (solar-geomagnetic activity) and anthropogenic sources of action on the weather and climate. It is shown that the determining mechanisms for controlling the weather-climatic characteristics are the processes of aerospace physical optics. The main source of the global warming observed in recent decades is an increase in solar activity on a secular scale, the chief channel of action of solar-geomagnetic activity is the control of the condensation-cluster mechanism of cloud nucleation, and the strongest energy effect is the regulation of the thermal radiation fluxes of the underlying surface by optically thin clouds. The greenhouse effect based on carbon-containing gases makes an insignificant contribution to global warming.
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