The two journal articles at the links below give great insights regarding present and future efforts toward a sustainable world. [Again, sorry about the copy-and-paste-on-another-page links, but I have no control over that. As far as I know, that's a Google-Blogger-Blogspot glitch.]
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1. Title - "Circular Futures: What Will They Look Like?"
https://www.sciencedirect.com/science/article/pii/S092180091931972X
2. Title - "Infrastructure Is Key to Make Cities Sustainable"
https://www.mdpi.com/2071-1050/12/20/8308/htm
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I've noticed on Twitter and elsewhere online that some environmental activists don't understand what's taking so long in regard to a shift to sustainability. They are a bit frustrated. I'm guessing these are mostly young people. No offense intended. As an old man who has been in this and a couple of related fields for many years (starting in 1970), I offer the following.
First, along with many others, I fully recognize that time - relative to the socio-ecological-economic CRISIS we're in - is short. The pace of research reflects that; the pace of implementation in most areas of the world does not. There are many reasons as to why. In my opinion, here are only two of those reasons, as follows.
1. Changing Spaceship Earth to genuine sustainability requires a major shift in attitudes, ethics, lifestyle, production, and consumption. Resistance abounds. Ignorance abounds. Propaganda abounds. Overcoming all that requires patience, and most of all, persistence.
2. One of the biggest obstacles (perhaps THE biggest) is the fact that mega money largely controls politics. The overwhelming majority of national politicians are selected, groomed, and financed by the Super-Rich Upper Crust. Surely by now this is common knowledge. Unfortunately, most of the Super-Rich are faux "Green". They've more or less been forced to talk the talk, but have little to no interest in anything ecological or sustainable. They're short-term thinkers. Until we get big money out of politics, little will change other than the Crisis getting worse and worse.
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Not only my opinion. Stay Well, & Persist