Related by context. Frequent words. (Click for all words.) 74 ecosystems 64 forests 64 biodiversity 61 marine ecosystems 61 coastal ecosystems 60 ecology 59 habitats 58 boreal forest 58 tropical forests 58 grasslands 57 ecosystem 57 forest 56 watersheds 56 habitat 56 wildlife habitat 55 vegetation 55 wildlife habitats 54 peatlands 54 marine ecosystem 54 ecological 54 flora 53 tropical rainforests 53 rangelands 53 rainforests 53 woodlands 52 biosphere 52 biodiversity conservation 52 soil fertility 52 species 52 soils 52 bio diversity 51 carbon sinks 51 Forests 51 Ecosystems 51 forestlands 51 wetlands 51 lichens 50 coral reefs 50 ecologically 50 fauna 49 wildlands 49 hemlocks 49 overgrazing 49 tropical forest 48 extinctions 48 savanna 48 fragile ecosystems 48 wildlife 48 grassland 48 forestry 48 Biodiversity 48 riparian 48 rangeland 48 wetland 48 tropical rainforest 47 ecologist 47 atmospheric CO2 47 timber harvest 47 timber harvesting 46 invasive species 46 aspen 46 mammal species 46 grasses 46 forestland 46 amphibians 46 reforestation 46 rainforest 46 fragile ecosystem 46 forest fires 45 lichen 45 conifers 45 pine forests 45 genetic diversity 45 forest canopy 45 deforestation 45 acidification 45 Vegetation 45 prescribed burns 45 invasive weeds 45 photosynthetic 45 soil erosion 44 conservation 44 mangrove forests 44 pollinators 44 habitat restoration 44 semi arid 44 bird species 44 forested 44 atmospheric carbon dioxide 44 prolonged drought 44 croplands 44 deciduous trees 44 conifer 44 Amazon basin 44 reefs 44 Douglas fir 44 foresters 44 populations 44 Ecosystem 44 trees 43 Amazon rainforest