The reason that there is an incentive for natural gas is because the same people who own the mineral rights to oil own the mineral rights to natural gas.
Or you can hand wave that all away and shout conspiracy theories.
And it is cheaper, but there are also significant questions about what will happen to that cost if consumption significantly increases via mass transit.
I'm all for lower emissions, but let's not pretend there isn't a vested interest behind it.
Especially when there are also other options that don't get nearly the attention.
https://www.computerworld.com/article/3147405/sustainable-it...