A one-way road trip from San Francisco to Los Angeles in a car with 30 MPG efficiency releases 135kg of CO2 to the athmosphere [2].
The only way out of this is to tax petrol high enough to convince people to take the bus.
[1] https://curb6.com/footprint/flights/los-angeles-lax/san-fran...
[2] https://www.distance-cities.com/distance-los-angeles-ca-to-s...