instruction:
In this task, you are given a question and a corresponding answer. Your task is to generate a fact statement that is useful in answering the given question.
question:
Question: Riding a two wheeled human powered vehicle is good for the environment because? Answer: it runs without fuel.
answer:
riding a bike does not cause pollution


question:
Question: When you start to drive away from your house, the longer you drive, your house will eventually look? Answer: smaller.
answer:
as distance to an object increases , that object will appear smaller


question:
Question: Pollution is? Answer: throwing a candy wrapper down.
answer:

pollution is a source of pollutants