Carbon monoxide is a gas produced by furnaces and other devices that burn fuel.
Carbon monoxide carbon monoxide is a health hazard.
Furnaces and other devices that burn fuel are health hazards.
What are the affects of burning fuel on human health?
Options:
(1) emissions
(2) They aid lung health.
(3) direct damage to the lungs
(4) They are a hazard.
(5) The affects are mildly healthy
(6) The fuel burns clean.
(7) Greenhouse gases
(8) Global warming