Well, a hybrid doesn't solve the problem. We don't need to reduce greenhouse gas emissions, we need to zero them out. You can't do that if you sometimes burn gas.
Zero greenhouse emissions isn't a remotely achievable goal.
I hope you have never run a technology project this way by starting with a goal that simply can't be accomplished; you would have set it up to fail, demoralized your team, and chased the wrong priorities.
The goal is net zero, meaning, emissions added = emissions removed. There must be an allowance for some emissions. Industrial human life cannot continue without some amount of greenhouse emissions.
For that goal, I am way better off driving less than buying a new EV - it releases greenhouse gases to produce the plastic in your Tesla and the battery in your Nissan Leaf.
I walk to the supermarket. I work from home. I don't eat red meat. I'm careful with my home electricity consumption. For the third time in this thread: my old 4 cylinder Corolla is not the thing standing between us and existential doom. Focus on more important things.
I don't understand the myopic focus on car emissions: is it because Elon talks about it? Is it because it's the most easily seen for you?
Your Corolla is worse than a BEV because it puts way more GHG in the atmosphere, making net zero harder. Your opinion that the Corolla emits less GHG than a BEV is not borne out by the data. Most of the pollution of your car is from using it, not building it. EVs flip that and only are only slightly worse to produce. And we have to replace pretty much every road vehicle with a zero emission one, and sooner is better.
Buying the new EV, selling your old car, and helping push ICE vehicles off the roads is better than not replacing it in any reasonable environmental accounting.
Also, 15% is... a very significant percentage. You have to do lots of efficiency improvements across every part of the world to make net zero happen. Not to mention that slice of the pie would grow to 30-40% if electricity goes zero-carbon.
And we simply have the technology to zero it out. But, like you, most people want to invent a reason the green technology is actually bad.