[juujian]

Renaturation is standard, but the environmental quality of result is still subpar. Sometimes it looks pretty, but plant and insect diversity is very low. It's a good idea to think about this -- i cannot think of any large scale example that has ecologic and not just PR value.

[btilly]

I've been to https://www.butchartgardens.com/. It is admittedly a highly artificial example, but it is an extremely pretty reclaimed coal mine that is reasonably large, and with good plant diversity. They don't use herbicides or pesticides, but instead rely on released insects to protect the plants. (Unfortunately they have not found an alternative to fungicides to protect the roses.) This suggests at least some insect diversity.

[logi2mus]

Well the site is semi arid desert so PV could be an option to use it.