Assertion: fuel cell | /r/HasProperty | pollution-free
Facets:
value: with heat
type: OTHER
value: with water
type: OTHER
value: virtually
type: MANNER
Source sentences:
text: With heat and water as the primary byproducts, fuel cells are virtually pollution-free and have more than two times the efficiency of traditional combustion technologies, which typically have an efficiency rate of 33% to 35%.