[Request]Is this accurate or at least approximate?

Consider population only for adults(14+ age) since google gave me there are 2 billion children(0-14 yrs)

If the calculation in image is wrong, what would the approximate emission would be even after every one started using evs?

Consider population only for adults(14+ age) since google gave me there are 2 billion children(0-14 yrs)

If the calculation in image is wrong, what would the approximate emission would be even after every one started using evs?