Private Jets VS Commercial Flight, more CO2 emission?

Question

Why would private jets emit more CO2 than a commercial flight?

Answer 1

they dont unless you are speaking per passenger

Answer 2

They don't, they just emmit more C02 per person.  This is why all the political figures who talk about saving the enviroment are scrutinized for jet setting all over the place.

Answer 3

That's probably more co2 per person.