CNG was introduced as an alternative fuel, the government jumped on it enthusiastically to the extent that they offered a substantial subsidy to anyone prepared to convert their car (have a familiar ring ?). It produced less power than gasoline and had a short range between fill-ups. None the less gas stations with access to the natural gas distribution network were coerced into installing special high pressure compressors and banks of storage cylinders. It was a classic example of a knee jerk reaction to the fuel crisis at that time, and seen as a way to reduce our dependence on overseas fuel supplies.
There was no consideration given to the fact that much of the country did not have access to natural gas, the large CNG tank substantially reduced boot space, and no-one jumped at the thrill of lower performance and difficult starting on cold mornings. One of the reasons that CNG fell out of favor and eventually disappeared was the mandated requirement for the cylinders to be pressure tested by an approved testing agent which involved taking the cylinder out of the car... at a cost. Most opted to simply removed the CNG conversion.
Jumping on the hydrogen bandwagon and forcing people into electric cars is another knee jerk reaction to a problem, chosen because big polluters are not so easy to push around. Go for the short-term solution, sell the benefits and ignore the downside... that's how politics work
Now, where did I put that gasifier ???
Cheers...