increased use of glass bottles. increased number of trees cut down. decreased pollution in trash dumps. decreased amount of books to read.
I gave my students this multiple choice question: A negative effect of the invention and use of paper is the

Only one answer is correct among these 4 choices:
- increased use of glass bottles.
- increased number of trees cut down.
- decreased pollution in trash dumps.
- decreased amount of books to read.

Could you tell me which one is correct?

increased number of trees cut down.