Believe it or not but the "ONE solution that solves everything" is already here. It's right in the comment you responded to. Not only does public transport and bike infrastructure cut massively down on CO2 it also helps with mental health as we aren't constantly 10+ miles away from each other but we also aren't getting constantly frustrated with driving or isolated. And not to mention with having everyone closer together wel also have room for car guys to hoon about in race tracks. And because ideally the only people driving would be car guys they'd be quite the minority and the emissions from that would be minimal anyway. There's almost 0 downsides to walkable cities. Even car guys have something to gain from this. Well finally get to the point that we can focus on the CO2 dumps that are airplanes.