instruction:
In this task, you need to write a topic word from the given fact. The topic word must have at least one word overlap with the given fact. The topic word often involves adding a new word from a related concept. In your topic word, use at least one word from the given fact. Topic words with two or more words work best.
question:
Fact: pollutants have a negative impact on the environment.
answer:
environment health.


question:
Fact: seasons cause change to the environment.
answer:
environment animal habitat.


question:
Fact: energy is used for heating a building by a heating system.
answer:

building office.