Related by context. Frequent words. (Click for all words.) 51 glacial melt 49 ecological catastrophe 47 ecological 47 Aral Sea 46 Issyk Kul 45 eutrophication 45 species extinctions 45 hydrological cycle 44 Amur River 44 Solovyov 44 overexploitation 44 Lake Baikal 43 ecological degradation 43 Tibetan Plateau 43 anthropogenic 43 Mitvol 43 glacier melt 43 ocean ecosystems 43 Serreze 43 ecologic 43 Baikal 42 glaciers 42 Trutnev 42 melting glaciers 42 Bogdanchikov 41 freshwater 41 methane hydrate 41 ecologically 41 ocean acidity 41 ecologically fragile 41 Kola Peninsula 40 Amur 40 ecology 40 biosphere 40 aquatic habitat 40 mountain glaciers 40 rapid industrialization 40 shrinking glaciers 39 aquatic ecosystem 39 icecap 39 Kamchatka 39 depletion 39 environmental degradation 39 Buryatia 39 Yakovenko 39 ecologists 39 urbanization 39 biota 39 oxygen depletion 39 taiga 39 acidification 39 Melting ice 38 terrestrial ecosystems 38 western Siberia 38 extinctions 38 river deltas 38 desertification 38 freshwater ecosystems 38 Rosenergoatom 38 biodiversity 38 Danube Delta 38 nutrient runoff 38 ecocide 38 marine ecosystems 38 Sverdlovsk region 38 Global warming 37 groundwater recharge 37 retreating glaciers 37 Amstrup 37 melting permafrost 37 Ocean acidification 37 manmade 37 pollution 37 Ovcharov 37 Songhua River 37 rapid urbanization 37 Ecologically 37 Transneft 37 aquatic ecosystems 37 fragile ecosystem 37 irrigated agriculture 37 icecaps 37 Kolesnikov 37 transboundary 37 habitat fragmentation 37 geological disasters 37 Desertification 37 fragile ecology 37 Worldwatch 37 anthropogenic climate 37 ecosystems 36 atmospheric carbon dioxide 36 aquifers 36 habitat degradation 36 Khabarovsk 36 Siberia 36 virgin forests 36 abiotic 36 Nikitin 36 bio diversity 36 oblast