Related by context. Frequent words. (Click for all words.) 61 salination 59 Soil erosion 55 damming 55 hydro electric dams 55 rampant deforestation 54 irrigated agriculture 54 fragile ecology 54 recharge groundwater 53 rivers 53 wetland ecosystems 53 environmental degradation 53 soil salinity 53 hydrologic cycle 52 severe droughts 52 ecological degradation 52 Brahmaputra River 52 aquatic ecosystem 52 riparian zones 52 Sutlej river 52 gully erosion 52 deforesting 52 dams 52 deltaic 52 siltation 52 groundwater aquifers 52 periodic droughts 51 hydro dams 51 glacial lakes 51 Tehri dam 51 conserving biodiversity 51 species extinctions 51 hydropower dam 51 nonrenewable resource 51 soil erosion 51 headwater streams 51 aquatic ecosystems 50 overfishing pollution 50 hydrological cycle 50 despoliation 50 prolonged droughts 50 toxic algae blooms 50 sand quarrying 50 environmentally destructive 50 Melting glaciers 50 Poyang Lake 50 Hetch Hetchy Valley 50 frequent droughts 50 hydroelectricity 50 tailing ponds 50 glacial melt 50 freshwater ecosystems 50 conserve biodiversity 50 River Chenab 50 ecologies 49 aquatic habitats 49 ecological 49 headwater 49 hydropower 49 creeks rivers 49 Carbon sequestration 49 coulees 49 trans boundary 49 hydro electric 49 driest inhabited continent 49 worsening droughts 48 heavily polluted 48 Yangtze River basin 48 melting glacier 48 freshwaters 48 aquifer recharge 48 lakeshores 48 ecologically sensitive areas 48 Godavari river 48 shoreline erosion 48 coastland 48 Coal gasification 48 floods droughts 48 biodiversity hotspot 48 waterways 48 Everglades ecosystem 48 Tar sands 48 riverbeds 48 glacier melt 48 aquatic habitat 48 hydrological 48 silts 48 Three Gorges Reservoir 48 rapid industrialization 48 rivers lakes 48 Ghaggar 47 Nagarjunasagar 47 ecologically fragile 47 Tipaimukh dam 47 streambeds 47 Tipaimukh Dam 47 Subarnarekha 47 Boreal forest 47 Great Artesian Basin 47 overexploitation 47 Droughts 47 receding glaciers