@urlyman It's the number of km that we travel which causes the problem. Flying is especially dangerous because people travel further. 10000 km in a day. You don't make journeys that long by car.
All powered modes of transport have fairly comparable emissions per km (yes, even trains once you include the cost of their specialized infrastructure).
If we consume fewer kms then we reduce our impact on the planet. Relying primarily upon human powered transport reduces impact to a minimum.
@hembrow precisely.
We’re gong to have to learn the hard way that being hyper mobile destroys the option to be hyper mobile