Answer the following question: Fact 1: Creating paper requires cutting down trees. Fact 2: Trees clean and cool the air. Given the two facts above, what does creating paper do?

Choices:
(1). duplicate itself;
(2). Makes the air dirtier;
(3). Makes food;
(4). Cleans the air;
(5). converting electricity to heat;
(6). to move people;
(7). Plant growth is reduced;
(8). Lengthens tree life;
Answer:
(2).