>Here viable means getting there with comparable travel time and cost but fewer CO2 emissions. That's the rub. It's rarely comparable travel time except some p

>Here viable means getting there with comparable travel time and cost but fewer CO2 emissions. That's the rub. It's rarely comparable travel time except some point to points. Even in Europe. I travel by train within Europe (mostly) whenever I can. But it usually takes longer, costs more, and may involve sleepers on longer routes.