Well, transportation is the biggest emitter. https://www.epa.gov/ghgemissions/sources-greenhouse-gas-emissions#:~:text=Transportation%20(28%25%20of%202021%20greenhouse,ships%2C%20trains%2C%20and%20planes.

And personal cars as well as trucks are the largest emitters among those. https://www.cbo.gov/publication/58861

I do agree that there should be done a lot more to make this go faster. One of the most obvious things is immediately outlaw the production of gasoline suvs. They‘re inefficient and rather pricey so you wont hit anyone who‘s life depends on it. Then outlaw the production of any gasoline sportscars.

Obviously the expansion of public transport is still important but selling new v8 suvs demoralizes anyone trying to do the right thing.