I know anti-car attitudes annoy some people, but we really should drive this home(pun not intended but taken advantage of). People keep using "a tank of gas" as a fungible, graspable unit of carbon emissions while not realising reducing that very thing often has an out-sized impact on carbon emission, sometimes more than other things like reusing clothes, internet usage of this or that services or saas, and so on. Transport is by-and-large the #1 source of emissions in the US[0], the majority of which are passenger cars and trucks[1]. Reducing car dependency would be one of the largest contributors to sustainability the US (and many other nations, but likely not as much as America) could do to have an impact on climate change
Pulled quote from [1]: "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."
[0] https://www.epa.gov/ghgemissions/sources-greenhouse-gas-emis...
[1] https://www.epa.gov/ghgemissions/sources-greenhouse-gas-emis...
Pulled quote from [1]: "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."