Why wasn't there ever investment in natural gas infrastructure to the scale of highways and the electrical grid?

If such an investment were made, we would all be driving natural gas powered cars by now. Additionally, fertilizers would be cheaper, and the cost of heating a home would be lower.
Update: Gas is fertilizer feedstock. Natural gas produces ammonia. 88% of ammonia is used to produce fertilizers. Without fertilizers, crops have a much lower yield. It's not possible to support 7 billion people without fertilizers.
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