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tree hill clouds sky nature environment green fresh beautiful spectacular view landscape scenery hillside grassland forest mountain valley plain plateau desert tundra savanna rainforest tropical forest temperate forest boreal forest cloud forest mangrove forest swamp forest peat forest bamboo forest palm forest coniferous forest deciduous forest mixed forest secondary forest old-growth forest primary forest natural forest planted forest agroforestry silviculture forestry deforestation afforestation reforestation forest management forest conservation forest restoration forest degradation forest fragmentation forest loss forest gain forest transition forest carbon forest soil forest water forest biodiversity forest ecosystem forest services forest products forest livelihoods forest governance forest policy forest economics forest history forest culture forest aesthetics forest recreation forest tourism forest education forest research forest monitoring forest inventory forest mapping forest modeling forest remote sensing forest gis forest mensuration forest ecology forest hydrology forest pedology forest entomology forest pathology forest genetics forest physiology forest microbiology forest biogeochemistry forest climatology forest meteorology forest fire forest pest forest disease forest invasive species forest drought forest flood forest storm forest landslide forest earthquake forest tsunami forest volcano forest glacier forest permafrost forest soil erosion forest desertification forest salinization forest alkalinization forest acidification forest eutrophication forest pollution forest contamination forest degradation forest fragmentation forest loss forest gain forest transition forest carbon forest soil forest water forest biodiversity forest ecosystem forest services forest products forest livelihoods forest governance forest policy forest economics forest history forest culture forest aesthetics forest recreation forest tourism forest education forest research forest monitoring forest inventory forest mapping forest modeling forest remote sensing forest gis forest mensuration forest ecology forest hydrology forest pedology forest entomology forest pathology forest genetics forest physiology forest microbiology forest biogeochemistry forest climatology forest meteorology forest fire forest pest forest disease forest invasive species forest drought forest flood forest storm forest landslide forest earthquake forest tsunami forest volcano forest glacier forest permafrost forest soil erosion forest desertification forest salinization forest alkalinization forest acidification forest eutrophication forest pollution forest contamination