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Re:Flight risk: can we take the carbon out of air travel? by ARandomerDude on Monday September 02, 2019 @07:34PM (#20862515)
Unintended consequence: you'll penalize shorter flights because achieving altitude is the least fuel efficient part.

As a result, you'll increase travel via car and the net result will be increased pollution at the expense of the economy.

Re:Flight risk: can we take the carbon out of air travel? by esotericn on Monday September 02, 2019 @07:54PM (#20862596)
Driving and flying have approximately the same emissions assuming 1 person in the car.

A bog standard 100g/km car would emit 600kg to go 6000km; a passenger flying London-New York also emits approximately the same. (Obviously you can't drive London-NY, it's an example).

Short haul, as you say, it tips in favour of the car. Multiple people and it becomes a no brainer.

Then take into account the fact that tons of journeys would simply not happen. It's common for people to jet around Europe for weekend trips. No-one would drive that.

I have a sense that US domestic flights tend to skew discussion on this.

Re:Flight risk: can we take the carbon out of air travel? by adt2bt on Monday September 02, 2019 @08:54PM (#20862873)
If the emissions costs are constant in terms of $/ton of CO2, the incentive would only exist if the car route is less polluting.