https://www.epa.gov/ghgemissions/sources-greenhouse-gas-emissions

Transportation (28% of 2021 greenhouse gas emissions) – The transportation sector generates the largest share of greenhouse gas emissions. Greenhouse gas emissions from transportation primarily come from burning fossil fuel for our cars, trucks, ships, trains, and planes. Over 94% of the fuel used for transportation is petroleum based, which includes primarily gasoline and diesel.2

To further break it down:

The largest sources of transportation-related greenhouse gas emissions include passenger cars, medium- and heavy-duty trucks, and light-duty trucks, including sport utility vehicles, pickup trucks, and minivans. These sources account for over half of the emissions from the transportation sector.

So the idea that transportation emissions from regular people is totally negligible compared to corporate excesses isn’t actually realistic. It’s a major chunk of it.