Related by context. Frequent words. (Click for all words.) 56 temperate forests 54 Melting glaciers 52 aquatic habitats 52 grassland habitat 52 aquatic ecosystem 52 ecosystems 51 subarctic 51 terrestrial ecosystems 51 biodiversity hotspot 51 habitats 51 species extinctions 50 forest ecosystems 50 warmer winters 50 evergreen forests 50 habitat fragmentation 50 wetland habitats 50 glacial melting 50 freshwater ecosystems 50 topographies 50 sandstone formations 49 melting glacier 49 escarpments 49 glaciated 49 peat bogs 49 snowpacks 49 glaciers melting 49 aquatic ecosystems 49 glacial retreat 48 retreating glaciers 48 bird migrations 48 amphibian populations 48 lowland forests 48 Warming temperatures 48 marine ecosystems 47 aridity 47 vegetation 47 hydrological cycle 47 cryosphere 47 habitat 47 hydrothermal activity 47 permafrost 47 headwater streams 47 tussock 47 glaciers 47 upwellings 47 biogeochemical 47 melting permafrost 47 alpine meadows 47 caribou herds 47 thawing permafrost 47 habitat degradation 46 lichens 46 Volcanic eruptions 46 giant sequoias 46 glacial lakes 46 marine sediments 46 ptarmigan 46 glacier melt 46 aspen trees 46 rock outcrops 46 prolonged droughts 46 glacial melt 46 aquatic habitat 46 overgrazing 46 boreal forests 46 species 46 boreal 46 triggered avalanches 46 Tibetan Plateau 46 Polar Regions 45 subtropical regions 45 mountain pine beetles 45 petrels 45 atmospheric methane 45 deciduous forest 45 woodland caribou 45 aspen 45 mountain ranges 45 mountain glaciers 45 Amazonian rainforest 45 pikas 45 ungulates 45 biota 45 coastal ecosystems 45 coral reef ecosystems 45 wildflower meadows 45 icecap 45 fauna 45 ecologies 45 avian species 45 lichen 45 drier summers 45 lodgepole pine 45 alpine lakes 45 landforms 44 geologically active 44 Invasive plants 44 wildlife habitats 44 biodiversity hotspots 44 seamounts 44 lynx habitat