[morsch]

Emissions will have to be reduced across all sectors, so if you merely manage to drop it to 2.5% of current emissions, that'll be a larger percentage in 2030 and 2050. If the trend continues and more people get more cars and drive them more (saving the world all the while), the share will increase further.

Of course an infinite supply of green energy would solve everything, but unfortunately that's not available. We're not supplying enough green electricity to cover current demands, much less enough to cover the roughly doubled demand if we were to shift all transportation to EVs.