We elucidated the reaction of ruderal vegetation community to environmental changes. It made it possible to assess the level and nature of the synanthropic vegetation dynamics, fluctuation processes, and also to indicate the scenarios of evolution of ruderal communities throughout the environmental changes, in particular, climate changes. In this study, we used the original methods: synphytoindications and estimation of the climate change impact and the species reaction according to their ecological strategy. Dataset included 1200 phytosociological relevés of different synanthropic habitat types (borders of fields, ruderal areas, and railway tracks). As a result of vegetation analysis, we obtained 16 alliances of ruderal vegetation belonging to the six classes and two natural vegetation derivatives of the