I have a pal who is exterminating the grey squirrels but the pet lovers are starting to fight back, through the animal cruelty legislation. I saw one in an open urban area scurrying north, about a week ago, an unusual sight. There's still some Red squirrel locally but are now irretrievably fragmented.
Cubes of forest soil might work as transplants - patches are too liable to dry out, perhaps. Forest would rapidly reassert in the city, even, though it could only have a fraction of the biodiversity of the woodland that appeared after the glacial retreat - simply because of the time scale. The Red Rose Forest has been sometimes planted where trees have never grown - up in the peatlands.
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