- Burning coal is a source of air pollution
- Using coal requires burning coal
- Hence, using coal is a source of air pollution

- Using coal is a source of air pollution
- Pollution has a negative impact on the environment / air quality / water quality / society
- Hence, using coal has a negative impact on an ecosystem

- Using coal has a negative impact on an ecosystem
- A problem has a possible negative impact on a thing
- Therefore, a problem with using coal is that it has a negative impact on an ecosystem

- A problem with using coal is that it has a negative impact on an ecosystem
- Damage has a negative impact on a thing
- Hence, a problem with using coal is that it damages an ecosystem

Hence, a problem with using coal is that it damages an ecosystem
Question
Many communities in the United States use coal to produce electricity. One problem with using coal is that

Context
- Burning coal is a source of air pollution 
- Using coal requires burning coal 
- A problem has a possible negative impact on a thing 
- Pollution has a negative impact on the environment / air quality / water quality / society 
- Damage has a negative impact on a thing