Stock photography, photos: Trees Stock photos of Hardwood forest trees. Photograph: © Dan Creighton Click for a larger image and more information Keywords associated with this stock photo: environment, ecosystem, concepts, plants, season, concept, outdoors, conceptual, scenery, beauty, tree, land, habitat, ecology, beautiful, forest, scenic, nature, trees, emotion, calm, cool, sadness, depressed, peaceful, unhappy, depressing, depression, emotions, emotional, outside, moods, serene, light blue, dominant colour, unhappiness, natural world, open space, mood, blue, blues, CATEGORIES, environmentalism, dominant color, sad, coldness, coolness