Ключевые слова: academic, african ethnicity, black, bottle, boy, boys, caucasian, caucasian ethnicity, child, childhood, classmate, conservation, development, ecology, education, elementary, energy, environment, green energy, holding, information, innocence, intelligence, intelligent, knowledge, lifestyle, male, outdoors, playground, recycle bin, renewable resources, school, school kid, schoolboy, schoolgirl, schoolyard, standing, student, summer, sunny, sustainable, tray, two people, uniform, walking, wisdom,