Construction costs are currently skyrocketing

I described this yesterday. Cross-sector emissions trading (and without a price cap). Then the market regulates it. Maybe not in the building sector, but elsewhere where it is cheaper. In the end, it is relatively irrelevant whether pollutants are released into the environment when heating or when flying to the Maldives.
Additionally, support for upgrading building envelopes through subsidized loans with low repayment and easy access. Simplifications in monument preservation. Cost-covering renovation levy for rented properties. But: no bans or explicit promotion of energy carriers. No regulations on renovation standard X outside of funding programs.

And we are introducing trade here in DE bindingly for the whole world? Everything is taxed multiple times here and then I get to choose whether I drive to work by car or fly on vacation every 2 years, otherwise it costs extra? Give me a break...

I believe the bitter truth is that when it comes to CO2 reduction / climate protection, it will not work without bans and clear (transition periods). I am certainly not an apocalyptic thinker – but unfortunately we don’t have a lot of time left because the last 30 years have unfortunately been very much (partially intentionally) wasted. And the longer we wait, the more drastic the measures will eventually have to be. And even though the discussion has fortunately shifted in favor of climate protection among the broad masses of society in recent years, some people still unfortunately do not understand what is quite certainly coming to us (or our children/grandchildren) in the next 50 - 100 years. Usually it goes like this: There is a ban on the table, the outcry is huge. Eventually day X comes when it is enforced, and somehow everything turns out to be not nearly as bad. Hardship cases need to be cushioned, of course. But I see it exactly as written above: The people who finance a house from the ’60s without renovation buffer, there is no help for them anyway. The state can do little for them. Their heating could break down at any time anyway.

But the bitter truth also includes that there are still many billions of people in the world who would like to have what we already have here. If we want to convince them that we are taking the right path, then our path must work.

At the moment, we are running off and shooting ourselves in both knees while sprinting.

But the bitter truth is also that there are still billions of people in the world who would like to have what we already have here. If we want to convince them that we are on the right path, then our path must work.

At the moment, we are running off and shooting ourselves in both knees at full sprint.

That is true. But I am actually quite optimistic.
The fossil age is over – the technologies for green, clean energy are all on the table or are already being used.
Everything will take its time and surely not everything will run smoothly, but it is also a real revolution. And even poor regions will benefit in some time from a safe, decentralized supply of cheap, renewable energy. Especially for these regions, this is a real chance to generate prosperity and catch up with us.

That's true. But I am actually very optimistic about it.
The fossil age is over – the technologies for green, clean energy are all on the table or are already being used.
It will all take time and surely not everything will run smoothly, but it is also a real revolution. And poor regions will also benefit in some time from a secure, decentralized supply of affordable, renewable energy. Especially for these regions, this is a real chance to generate prosperity and catch up with us.

I also think the biggest problem is the speed. Our bureaucracy, the slow grinding mills.
Technologically, we have what we need, we just have to move faster. And get rid of this "but the others!!1elf" mentality, and admit to ourselves that in relation to Germany’s area and population, we cause and have caused disproportionately a lot of damage, when viewed globally.
By the way, on this whole topic, Jan Hegenberg (who blogs under the name Graslutscher) has released a good book. Not the usual doomsday mood, but garnished with the dose of optimism that we all currently really need. =)