Everything else relies on miracles and/or unobtainium.
I'm not advocating it, but it is the off-the-shelf option that would supply all power without CO2 emissions. No miracles or unobtanium needed.
Not converting everything is a choice, and so is producing nuclear waste.
De-industrialization would result in growing population and an even more massive increase in the conversion of wildlands to food production.
Tax meat production heavily.
Tax air travel heavily and these taxes should increase exponentially per journey per person.
Stop shipping goods half way around the world… make the things you need locally.
Improve the grid and invest in plans for heating using electricity.
Build hundreds of small nuclear plants.
I think that’s net zero roughly but it’s not possible politically even though it’s a feasible solution to the problem.
There is an alternative path and that is radical renewable energy production. Many of the things you mention are not intrinsically harmful, they are only harmful because of the dependency on fossil fuels. For example, shipping things around the world is not intrinsically harmful, it is only harmful because it today requires fossil fuels.
From this perspective the actual problem is a shortage of renewable energy. If we build vastly more renewable energy capacity then we can make fossil fuels economically unviable. Since that is a problem of money rather than politics it is much more viable as a solution.
Shipping isn't particularly polluting by it's nature. Currently we allow people to burn some really dirty fuels in ships on the basis that it won't directly affect too many local voters and the fossil fuel industry needs to do something with the stuff they can't burn near people, but it would be relatively easy to regulate and is generally tightening up over time.
Moving to clean ammonia or hydrogen engines is also very doable.
Carbon taxes are often a talking point for politicians that don't actually want to do anything but many of your ideas could be better implemented as carbon fees and/or tariffs so that it will optimize for greenhouse gasses directly, not for what people think is the carbon cost of something.
That's very true but nevertheless we could improve things very considerably by manufacturing products that are very much more durable. Today, much of production is given over to manufacturing crappy junk that has a very short life and there's almost no political will to stop it (even Greenies are known to buy junk because it's cheap and they've no cohesive or determined plan to improve the situation).
Instead, it's inevitable that we'll fall back to blunt tools such as carbon taxes that disproportionately disadvantage the poor - and we can be certain of this fact irrespective of what politicians might say or promise, as it's a dog-eat-dog world and the poor have always had less political power and clout than the rich. (Sometimes even I have difficulties paying my electricity bills and a carbon tax will stress my already tight budget even futher.)
It's inevitable that we'll arrive at suboptimal solutions such as carbon taxes in that they are lowest common denominator thinking (as it's my experience that the collective decision-making IQ of politicians is well below the 100 mark, thus we cannot expect to see smart solutions arising from them).
Around where I live shops are filled all sorts of crappy lowgrade goods that are specifically designed as throwaway items and the situation is almost identical everywhere else.
If all this junk were replaced with more durable goods (and we stopped buying so much unnecessary stuff that we don't actually need) then I'd reckon we'd do better than having a broad non-selective carbon tax.
When we eventually do end up with a carbon tax then it ought to be applied to selective industries - ones that could would actually benefit by upgrading plant and facilities and it should only apply on the proviso that the replacement equipment is more efficient/less polluting. Adding a carbon tax when no reasonable or economic improvement is possible will only raise prices without any benefit (that's why it'd be best to apply it across processes that would specifically benefit from being upgraded than across complete industries per se).
One may ask how feasible is it to improve the durability of everyday items. Answering that in detail would, no doubt, fill many volumes but I'll finish with a couple of examples involving household objects to demonstrate that it's not only possible but that it's already been done in the past and that somewhere along the way that manufacturers - along with our (consumers') blessing - ditched the idea.
My family is still in posession of an old hot-dipped galvanized bucket that belonged to my grandmother and it dates from early in the 20th Century (likely from around the time she was married) and it's still fully serviceable. Despite being at least 100 years old and having a few dents of no consequence, it still has its handle (which is also galvanized) and it has no rust whatsoever (as proper hot-dipped galvanizing works extremely efficiently at preventing rust).
Now compare this with the three cheap and nasty plastic buckets I bought at the supermarket recently - two of which had the handles fall off before I'd gotten them home. Sure, if it were possible to buy a galvanized bucket today of that quality (and it's not, as I've looked unsuccessfully) then I'd argue that in any comparison with its modern plastic equivalent the old bucket would be an order of magnitude or two ahead in the longevity/cost equation. This is a no-brainer (as one of my plastic buckets is already landfill after having split). (The psychology of why people buy junk goes deeper than just the fact that it's cheap.)
Not long ago I saw a documentary tour of Cuba and the Caribbean presented by the delightful Johanna Lumley and at one point she interviewed an old woman - one of the Cuban aristocracy who'd not left Cuba at the time of the revolution - and who was still living in her rundown mansion that had not seen any maintenance for 60-plus years.
During the tour of the kitchen the woman casualty and a little apologetically pointed to her old fridge then she gracingly remarked to the effect "we bought it in 1946 and thankfully it's still running". For anyone familiar with buying domestic appliances and that's most of us, it's NOT possible to overlook the significance of this statement. Right, this domestic fridge has worked for three quarters of a century and I'd bet it'll still be working at the century mark in 2046 (that is, if someone doesn't ditch it after the woman dies).
In my opinion, the fridge ought to be rescued and put in a museum as a tribute to what manufacturers actually did before planned obsolescence and financial greed possessed them totally!
Unfortunately, I remain pessimistic: the two reasons why this fridge is still in use today is that was actually built to last, which is not the case with most things manufactured nowadays, and because of Cuba's longstanding dire economic conditions; that is, its utility has outweighed fashion - as in Cuba fashion is still too much of a luxury to change it for a later model.
The fact is if we're truly serious about cutting back on manufacturing - or as I ought to say 'optimizing' manufacturing - then we need to readjust our thinking about replacing stuff just for the sake of it. I'm pessimistic because the world's situation isn't perceived to be sufficiently dire by governments, manufacturers and sufficient numbers of ordinary cosumers for that to happen - and it's unlikely to happen anytime soon. As I've shown, for that to happen living standards would have to fall to a level similar to that of Cuba, which, by then it'd likely be too late to rectify things.
> (as it's my experience that the collective decision-making IQ of politicians is well below the 100 mark, thus we cannot expect to see smart solutions arising from them).
This is something I tend to think too. Any popular idea must be stupid because it has to be understandable to a majority of people, which includes low IQ ones. I wouldn't blame politicians though - they're just a reflection of what the population wants. It's their job to placate people, no matter how stupid or wrong those people are, otherwise they'll get fired.
