Human, Tree, Plant, Vehicle, Automobile, Car, Transportation, Vegetation, Outdoors, Wheel, Machine, Urban, Campus, Road, Grass, City, Building, Town, Pedestrian, Apparel, Clothing, Nature, Land, Path, Ground, Forest, Woodland, Tree Trunk, Walking, Fir, Abies, kids, children, cleaning, ecology, ecological, teamwork, voluntary, volunteering, garbage, trashbag, stream, juvenile, waste, serviceman, skilled worker, worker, improvement, environment, person, youngster, cooperation, child, situation, kid, minor, volunteer
Children working in teams and cleaning their local stream.