Intruiging jon, but I don't get how I, or Harare come into it - give us a clue!

Here's an example of a Council (no names) with a reasonable selection criteria:

1. Maintain and enhance biodiversity and avoid irreversible losses.
2. Use land and existing buildings efficiently and prioritise development on previously developed land.
3. Promote sustainable waste management solutions.
4. Use and manage water resources in a sustainable manner.
5. Reduce the need to travel and promote more sustainable forms of transport.
6. Reduce impacts on climate change through energy efficiency measures and promotion of renewable energy solutions.
7. Reduce environmental pollution.
8. Reduce social exclusion and poverty.
9. Provide decent and affordable housing for everyone.
10. Provide a safe and healthy environment in which to live.
11. Protect people and property from the risk of flooding.
12. Provide a high quality built environment.
13. Maintain the identity and function of individual settlements.
14. Conserve and enhance the historic built environment and archaeological assets.
15. Conserve and enhance rural and urban landscapes.
16. Promote a sustainable, diverse and vibrant sub-regional economy.
17. Provide opportunities for a highly skilled and educated workforce.
18. Enhance the...

Climate change issues tend to be at the top and there's quite a few of them.

If you want to redefine "sustainability", you could condense the 'environmental' criteria (items 1-7 on the above list) into say one or two items and put them at the bottom of the list. If anyone's gone the whole hog, issues such as climate change, biodiversity, water, natural resources and so on could be excluded from the list entirely.

And remarkable ruins they are too. Outstanding skill levels in stone-masonry standing among the grass-thatched huts of today.