Who would drive? We have, for better or for worse, no one-world government. We don't have a great way to overcome free riders, etc. A nation or group of nation

Who would drive? We have, for better or for worse, no one-world government. We don't have a great way to overcome free riders, etc. A nation or group of nations can choose to reduce their emissions, but this means it's easier to undercut them on the global market. The same thing happens with human rights - it's cheap to buy stuff made by enslaved people, so we do. There's no body that's really able to price negative externalities correctly. Emissions kill people - lots of people - yet there's no real price for using other people's lungs as a dump. For a brief window that body might have been the US and its hegemony, but the US doesn't have the power it used to. Perhaps China will take up the mantle - not much benefit to conquering the world if there isn't a civilisation left. We should still do what we can, of course. Perhaps enough students on the bus can shift their weight or grab the wheel enough to stop it careening down the ravine. Technological advances have certainly helped in terms of making renewables more competitive against fossil power. I also think teens are largely sad because they are lonely - so are adults; we have fewer friends and see them less than we used to, and social life has been torn to shreds. My mom thinks the same; she grew up on streets where kids ran outside to play with friends and neighbours _all day long_. But there were far fewer cars (and they were smaller and slower), and there was a parent in almost every home to keep an eye on things out the kitchen window.