How to incorporate solarpunk into the modern city?

I'm from India, and here we build very functional buildings- non-asthetic, soulless and only what's needed. Whenever I see poeple complaining about the beauty of a city, I see them comparing it to famous megacities- New York, Tokyo, Shanghai, Hong Kong etc.

But here, I see people appreciating a different asthetic- buildings with creepers, plants growing over them. This got me thinking- what could be a large scale city, made entirely keeping sustainability in mind look like?
Don't get me wrong, the pics of Chengdu seem nice, but it's just some plants masking what is essentially a concrete jungle. I'm asking about a city built by enviromnent conscious people, from the ground up. What will be the building materials? What will be the transportation? What will roads/public infra look like? What will be the energy sources? How will food production be accomodated? Will it be a self sufficient city or a globalised and specialised one?
Feel free to share your ideas about the cities of the future.