I'd say it's in practice in Georgia and the Carolinas. There are plenty of corridors, from
land planted to pine
trees to creeks to swamps to Federal and State parks, there's a lot of
native biodiversity left. Probably more than there was 100 years ago when every piece of land that could be planted to cotton was. After the boll weevil rolled through the area, a lot of that cotton acreage reverted back to pine forest.
You can tell by the amount of native wildlife that is in the area. If there are plenty of
deer, turkeys, raccoons, possums, turtles, etc., then the ecological system to support them is still there. I know that I am connected to the wild ecosystem, given all the critters that pop up in my garden.