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The contribution of anthropogenic and natural greenhouse gases to theatmosphere from the territory of Russia, China, USA and Canada to globalclimate change under different scenarios of anthropogenic emissions in the 21stcentury has been assessed. It is shown that the consideration of the changes inclimate conditions can affect the impact indicators of greenhouse gas emissionson the climate system, especially over long time horizons. In making decisions,it is necessary to take into account that the role of natural fluxes ofgreenhouse gases into the atmosphere from the terrestrial ecosystems canchange. For all the countries considered, the uptake of CO$_2$ by terrestrialecosystems under all scenarios of anthropogenic impact begins to decrease inthe second half of the 21st century, so its stabilizing effect may graduallylose importance. At the same time, methane emissions in all of the consideredregions are increasing significantly. The net effect of these greenhouse gasnatural fluxes in some cases can even lead to warming acceleration by the endof the 21 st century.

Model estimates for contribution of natural and anthropogenic CO$_2$ and  CH$_4$ emissions into the atmosphere from the territory of Russia, China, USA  and Canada to global climate changes in the 21st century