What is the fine-grained topic of the following text: Find compressed natural gas (CNG) and liquefied natural gas (LNG) fueling stations in the United States and Canada.For Canadian stations in French, see Natural Resources Canada.Crude oil and other liquids produced from fossil fuels are refined into petroleum products that people use for many.Select a location that is the highest point possible above the top. Only return the topic.
Locating CNG and LNG fueling stations in the United States and Canada