Ключевые слова: background, blank, collection, combine, concept, consumption, day, disposal, document, eco, eco friendly, ecological, education, environment, examination, friendly, garbage, global, heap, hold, management, material, pack, paper test, papers, paperwork, pile, pile of paper, preparation, print out both sides, quantity, recycle, recycled materials, recycling, reduce, report, reuse, rope, school, sort, stack, stacked, tie, used, used paper, waste, waste paper, wastepaper, white, work,