Carbon monoxide is a gas produced by furnaces and other devices that burn fuel, and carbon Monoxide Carbon monoxide is a health hazard. Given these facts, what are the affects of burning fuel on human health among the following options:
- emissions
 - They aid lung health.
 - direct damage to the lungs
 - They are a hazard.
 - The affects are mildly healthy
 - The fuel burns clean.
 - Greenhouse gases
 - Global warming


 

    They are a hazard.     