Qhov tseem ceeb ntawm qhov rooj hluav taws yog qhov tseem ceeb hauv kev tswj kev sib kis ntawm hluav taws, cais cov hluav taws, ua kom muaj kev nyab xeeb ntawm cov neeg ua haujlwm thiab txo cov khoom poob. UL qhov rooj hluav taws siv nyob rau hauv North America thiab txawm tias lwm lub teb chaws thiab cheeb tsam nrog cov qauv UL lees paub.

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