increased use of fossil fuels decrease in water supply loss of animal habitats pollution of air
I gave my students this multiple choice question: Some paper mills use machines that make paper without any wood called "wood-free" paper. These machines make paper from materials such as cotton and rice waste. Which problem does using wood-free paper affect most?

Only one answer is correct among these 4 choices:
- increased use of fossil fuels
- decrease in water supply
- loss of animal habitats
- pollution of air

Could you tell me which one is correct?

loss of animal habitats