Housing has a huge carbon footprint. High energy efficiency standards will drive up prices to the point where building affordable housing isn't economically viable. What would you propose here?
Subsidies for the people who have already inhereted their own homes, so they can put free solar cells there which our economic sector (middle class) imports from china (every 30 years, because lifespan). Lower the energy footprint of old homes over time by retrofitting (not only solar). Which is costly and no one can afford. So that the issue is solved in terms of marketing, but not actually.
You don't need more houses, because world population figures are declining. If you have too many unused privately owned homes because of "investment portfolios" - wait until babyboomer have died (the ones with money and numbers), then have millennials in their 60's fight for living space in cities. Before that, this issue will not even be touched.
Build 'not actual houses' like Kanye does for the poor (sorry, that one is actually a joke).
Individual transport needs to change massively. You could incentivize bicycling or taking public transport, you could disincentivize using cars but for those stubborn ones, how would you mandate change of behaviour when it comes to individual transport? Increasing prices for high emission transport options through taxation would probably work but will ultimately make the same people suffer who would also be struggling with increased housing cost.
Transport as a service. Get people into self driving UBERs and apps that can offer them more viable "route stitching" with public transport, so your transporation systems will become more efficient. It just doesnt work for rural populations. So that the issue is solved in terms of marketing, but not actually.
Airtravel is a big problem. You could either increase prices by taxation to disincentivize flying or limit flights to a certain amount per person per year.
Dont do anything about that. Leave it as be. You don't even have a marketing solution for that one. Airtravel will increase by large amounts as the developing world reaches developed world status. Fake out people, that not taking actual world spanning vacations is the new cool. Sell them on VR, or something. (Virtual (as in not real) content.)
Personally I try to do my best to limit my energy consumption wherever I can.
Why?
You know, that you are only doing that to help ease the transition phase until renewable energy solutions are viable and deployed - right? So that the third, maybe forth generation after yours may have more worthwile living conditions.
You do it for 'heaven'.
Which brings us to 'pray for technical innovation' in which the babyboomers havent invested in - in their last 40 years. Then don't conjur up revolutionary tendencies - because it would make things even worse.
Here is your Sophies choice. Keep people 'poor' (not asking for economic development), by keeping them poor. Or keep them poor, by making them think, that poor is the new hip. Millennials didn't buy the second one. But Gen Z did. In Europe mostly. So I guess - as a babyboomer, don't look at your children anymore, and spend more time with your grandkids.
edit: Also - the reason, why I'm emotionally invested into this is, that I know video games. And to me the believe that it would be possible to keep people engaged in virtual worlds or economies to keep their dreams and aspirations there - even if just for one generation. Urks me to no end.
The only thing that hurts me more is people that tell me 'I try to do the best I can do in my life - to live a little less'.
And the only thing that hurts me more than that is if people ask me if 'I want to do actual marketing, so more people would think that way' - or actually pick up a concept of a worthwhile life, that we create for them in marketing or in NGOs.
I cant count the articles of "the millenials aren't able to think in just potentials anymore" I've read in my life. So this is a well established notion in the political sphere as well.
If its true, we have to see. The next climate summit is in September in New York. It is expected, that most of the US will also make "we'll be carbon neutral by 2050" pledges.
(See Merkel speech from a month ago in Harvard for example.)