Why does carbon constraint have little impact on the transportation sector?

[stm19950929]

I set a carbon neutral scenario for China's overall energy system by 2050, based on the global cumulative per capita carbon emissions allocation principle, and found that the carbon constraint set has a very weak impact on the transportation sector. the difference in emissions between the 2°C and 1.5°C scenarios for the transportation sector is less than 1%. what can be done to improve this situation?

[DLoughlin]

It might be worth checking the shareweights on alternative transportation technologies. By defaults, shareweights for EVs are typically 0 in the calibration year, then increase via a function (s-curve or linear) to 1 in a future year, such as 2050. The shareweight can be interpreted as a measure of bias or barriers (due to public acceptance, time it takes to build up infrastructure, range anxiety, lack of charging infrastructure, etc.). One thing you could try is to modify the shareweight paths such that these biases are removed sooner (e.g., 2035). Be careful when modifying shareweight trajectories. They are most often specified in the global technology database and the interpolation rules take precedent over individual values you supply.