If I could pretend I was the Creator and craft a more positive future, I would imagine a future that has a lower carbon emission through minimizing the unnecessary wastes in our lives.
Every household would hold on to pre-existing plastic bags and reuse them until they break, or even use fabric shopping bags.
People would have significantly smaller wardrobes, and keep wearing garments for longer. If they would reuse broken clothing for cleaning rags, that's even better.
I hope everyone would cook their own food instead of eating out, to nurture both their own health and the environment's health.
For people who don't already own cars, they would bike or walk, or take buses for modes of transport. Even those who drive already can carshare to reduce carbon emissions.
Not only does it help achieve carbon-neutrality, we would also help people emerge from a previous materialistic lifestyle that's damaging to their well-being.
Basically, these are the pillars to my minimalist utopia:
80% at home eating, 20% restaurants
more bikes and public transit