Anthropogenic increase in greenhouse gas concentrations in the atmosphere. The greenhouse effect is caused by water vapor, CO2, CH4, N2O, and some other gases, whose content is negligible (freon, perfluorocarbons, hydrofluorocarbons, sulfur hexafluoride). It should be noted that the greenhouse effect has always been since the inception of the atmosphere, but currently holds the anthropogenic enhancement of this effect. Burning fossil fuels is the main source of the emergence of anthropogenic CO2 (3 / 4 increase in concentration), and another 1 / 3 accounts for deforestation and land degradation. Increasing concentrations of methane as caused by human factors (livestock, rice cultivation, landfills, leaks of natural gas, coal mine gas emission, etc.), and increasing concentrations of nitrous oxide at 1 / 3 due to anthropogenic causes (agriculture and chemical industry).

To date, the concentration CFCs in the atmosphere reduced in connection with the action of the Montreal Convention. It should be emphasized that the historical period in 100 200 years of sharp increase in greenhouse gas concentrations can be called a "chemical attack", Figure 4. Strengthening the radiation heating the atmosphere and the increase in average temperature. Under the radiation balance of Earth's atmosphere to understand the relation perceived and lent atmosphere heat fluxes. Total incoming solar radiation (342 W/m2) is almost equal to the amount of radiation directly reflected the atmosphere (107 W/m2), and outgoing longwave radiation from Earth (235 W/m2).