This article examines the impact of climate change on different ecosystems (boreal, tropical) APR on the territory of Russia, Mongolia, China, received in the course of research in key areas of investigated territory; provides a comparative analysis of the reaction of these ecosystems to global climate change. It is concluded, that there is some reaction of the forest ecosystem to climate change. This reaction is differently. It is noted the importance of socio-economic problems which have significant impact on ecosystems, along with climate change. Carried out researches allow to conclude, that it is necessary to investigate additionally how imposed climate-driven and direct human impacts to changes in forest and forest steppe ecosystems.