Assertion: space heater | /r/CapableOf | pose additional risk
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text: In addition to the risk of fire, the Iowa State University Department of Agricultural and Biosystems Engineering warns that space heaters that use kerosene, propane, and natural gas pose an additional risk of releasing carbon dioxide (CO 2 ), carbon monoxide (CO), and nitrogen dioxide into the air if they aren't properly vented, which can lead to serious health problems and even death.