But the changes we actually need run much deeper, and they would directly impact our lifestyle, because our current one is not sustainable. The problem with that is that if governments were to attempt to implement those changes, they will be voted out. For instance, the French government tried to do a carbon tax, but was met with weeks of violent protests.
It's also a game theory issue for governments: putting a carbon tax on your country's production will make your economy less competitive compared to those that won't. You can mitigate the consequences for that by carbon taxing imports, but that will not help you with your exports.
The bottom line is that we need to do much more, but it's politically not feasible at this point. It will only be when people's lives are being much more severely impacted, but by that time, it will be too late to avoid a catastrophic outcome. IMO the only realistic hope we have is the development of active carbon capture technologies that can be deployed on a global scale. Whether that is feasible in time remains to be seen.
In exactly what sense is our current lifestyle not sustainable? The way you've stated the assumption it's analogous to arguing that we can't feed billions of humans. That's precisely the Malthusian argument, which was wrong. Agricultural productivity has increased by orders of magnitude in the last couple of centuries.
I'm not arguing against solving climate change. But the "we have to change everything" formulation is very limiting. In fact, I think it's pretty much a guarantee that we'll experience catastrophic effects.
I've always lived a very low-impact life in proportion to my rise up in economics until just this very year or so, although I am going on 6 years as a vegetarian. Not bad for 56 years I think. I even lived a year in Indonesia in a rice-farming village with predominantly dirt floors with electricity equal to one US apartment (not house) running the few bulbs, radios and TVs in a local population of 100 plus people. I was very happy, and maybe I will go back there, and wait out this disaster (Covid-19, modern life!). I am capable of doing high-tech work, or fix-anything work, so I don't need to be tethered to the internet or a computer to earn my living. I like to think of what Harlan Ellison would write about all of the smart phones, tablets, etc. in the same vein as he did in "The Glass Teat" about television and its sequel "Another Glass Teat". I like Scott Locklin's disparaging term for these and many other modern must-haves as "nerd dildos".
Change will happen by you and I making personal choices and changes and coming to the realization that all the things we think we need, we don't, or at least not in the quantities we believe we do. Eventually lack of outdoor life, sitting all day hunched over a screen, and avoiding reality will have its consequences with bad backs, hearts, minds and spirits, so government or no government, individual lifestyle changes or not, consequences will come a calling and give us feedback whether we like it or not. I am a believer in what the author attributes and quotes from Ghandi, but here's the actual quote:
“We but mirror the world. All the tendencies present in the outer world are to be found in the world of our body. If we could change ourselves, the tendencies in the world would also change. As a man changes his own nature, so does the attitude of the world change towards him. This is the divine mystery supreme. A wonderful thing it is and the source of our happiness. We need not wait to see what others do.” – Mahatma Gandhi
This would suffice. Let capitalism take care of the rest. It is simple insane that we are rolling with 1.3M year old technologies (burning shit) when new technologies already available because government intervention. Renewables, nuclear energy and few more alternatives already exist yet we are paying big money to oil companies to mine oil, do fracking (good bye clean water later) and burn coal. Absolutely insane, cave man level, literally.
Who cares if US-centric emissions go to 0 if the rest of the world goes up 3x+ because developing economies go for the cheapest energy sources?