He didn’t set this in motion, but part of Barack Obama’s legacy may be the return of American cities to prairie or farmland.
The government looking at expanding a pioneering scheme in Flint, one of the poorest US cities, which involves razing entire districts and returning the land to nature.
Local politicians believe the city must contract by as much as 40 per cent, concentrating the dwindling population and local services into a more viable area.
The radical experiment is the brainchild of Dan Kildee, treasurer of Genesee County, which includes Flint.
Having outlined his strategy to Barack Obama during the election campaign, Mr Kildee has now been approached by the US government and a group of charities who want him to apply what he has learnt to the rest of the country.
Mr Kildee said he will concentrate on 50 cities, identified in a recent study by the Brookings Institution, an influential Washington think-tank, as potentially needing to shrink substantially to cope with their declining fortunes.
Most are former industrial cities in the “rust belt” of America’s Mid-West and North East. They include Detroit, Philadelphia, Pittsburgh, Baltimore and Memphis.
In Detroit, shattered by the woes of the US car industry, there are already plans to split it into a collection of small urban centres separated from each other by countryside.
So Kildee is about to become the bulldozing czar?
This raises a number of questions — like where all the people who lived in these cities have gone, for one.
Second — and more difficult to answer — is this: does this have anything to do with the fringe conservationist movement to “rewild” North America?