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tree forest nature sky green blue leaf branch canopy woodland dense thicket cluster grove copse stand pine fir spruce larch cedar hemlock cypress sequoia redwood conifer evergreen deciduous broadleaf needleleaf temperate tropical subtropical boreal taiga tundra rainforest canopy understory groundcover biodiversity habitat ecosystem resource timber lumber pulp paper fuel shelter shade food medicine aesthetics recreation tourism camping hiking fishing hunting foraging research education conservation preservation sustainability