In the city, cars will average 15MPG (or less). So cars will emit 1.3 lbs of CO2 for every mile driven. Scooters take 0.100 kWh or less to go 1 mile. So a scooter in California will emit less than 0.061 lbs of CO2 for every mile driven.
So a car emits over 20 times as much CO2 as an electric scooter for the same mileage driven!