Give England to Italy. Drive everyone in England at gunpoint to live in a walled-off Westmorland to make room for the Italians who will move in to the rest of the country. Make it illegal for the so-called English to do anything but subsistence farming, and maybe some backbreaking manual labour outside of Westmorland for pitiful wages (and under constant watchful guard). And even then, make sure to murder a bunch of the English from time to time to remind them who's in charge and that they shouldn't get uppity towards their superiors.

And if any English complain, remind them that the Romans were living in and ruling England 2000 years ago, which obviously gives the modern Italians the right to inflict extreme disproportionate violence on any English who dare to complain about this arrangement.

i read a webcomic where that happens

unfortunately, they just put the cities in bathyspheres

Eon-term: gently nudging the sun's orbit through the galactic disc so that in the unthinkably distant future we can make our liquid water zone do a kissy with a red dwarf's liquid water zone, handing off the earth to something with a real lifespan.

edit: we probably want to take Jupiter with us if it hasn't already got a gas giant to herd away the asteroids.

You stole my answer

The absence of ground sloths is one of the worst things about the holocene. No offence to two and three toe'd sloths but, like...

honestly seems like a good place for some mild subterranean architecture. See what it's like, living like a Tolkien dwarf; a few hobbit houses built into artificial hills. Just make sure you have solid water runoff instalations

but the ecology is healthy, so what sort of geoengineering?