Gosh , what does he mean ?
Well, the EU and the UK both have carbon trading schemes where there is a trading price for a tonne of CO2, The idea being to drive down the CO2 output from big emitters like steel plants or power stations You can argue the details but it is meant to be "the price of polluting ".i.e not avoiding CO2 output by an industry.
So, IN THEORY you can compare the cost of buying BEV over a IC car across its life and see what is the price of polluting" i.e. avoiding CO2 pollution for a car vs a steel plant etc.
So , for example a IC car has 120gms/km and the BEV zero. The car does 10K miles/ 16K kms per year over a 12 yr. life. So 120*16,000 * 12 = 23 tonnes of lifetime CO2 output.
Now that size of car has a BEV vs IC penalty of say £8,000 in the UK. Then the "price of not polluting per tonne of CO2 is 8,000/23 = £348 or Euros 407 per tonne.
Then if my sums are right we can compare that consumer carbon avoidance price with the current Eu carbon permit price under the EU ETS (emissions trading scheme) .
Answer ETS price is 56 Euros.as of today. So, you COULD say the current automotive carbon penalty price ( basically the battery) for a car is 407 Euros vs 56 euros for industry or seven times higher. Now , all this is playing with environment econometrics ( use some nice big words ) but if you want to use legislation to reduce global warming there is a strong logic to setting one "price of CO2" price and letting all industries work out the best solution for the planet.