Recently, there has been a resurgence of hand-⁠made papermaking, both as an art practice and as a way to recycle. Paper can be made out of almost anything organic from cotton to linen to banana peels. This means that paper can easily be made from bits of cloth, old clothes, as well as old paper. This type of material can go a long way. For example, an old cotton t-⁠shirt and some old written on notebook pages could make over a hundred sheets of paper. With multiple colors of cloth and paper, dyes, and specialty items such as dried flowers that can be enclosed into a sheet of paper, the possibilities for paper creation are endless.
Причины 1, 2 и 4 указаны.

Ответ: 3.