[andrepd]

That's a bold assertion.

Never mind that you know what's also not "sustainable", if the definition means "costs > revenues"? Automobile roads :)

[TheOtherHobbes]

The fossil fuel industry gets a global subsidy of $7tn a year if you include implicit costs, on top of $3tn year in revenue.

Worrying about train fares seems a little petty in comparison.