I don't recall the figure off the top of my head, and you're right there are other aspects of emissions that are larger, but I wouldn't call passenger autos a "very small" component of global warming*.
@repoman0 was stating the obvious that the auto industry could have been a part of the solution much earlier, but Detroit has been too addicted to light trucks profits to care.
I remember an NBC News (or Dateline, don't laugh) segment about two decades ago where the story was that Ford could easily build a fuel-efficient Explorer if they really wanted to. It didn't require any breakthrough technologies beyond what was already known at the time.
Besides GHG emissions, there are other environmental and geopolitical reasons to gradually sunset our reliance on big oil.
*
https://ourworldindata.org/co2-emissions-from-transport
Learn about the effects of carbon pollution from transportation.
www.epa.gov
Even perma bull Dan Ives slammed them for the CON call. Nobody believes an unrevealed "Tesla Model 2" is ready for production in calendar year 2025. At best, they might offer a super cut down version of the Model 3, but that only reduces margins even further.