Housing 100 billion humans on Earth - another take
More than a year ago, I wondered what modifications are needed on and in Earth in order for it to house 100 billion (1011) humans, without serious interference with other life forms.
X-SEED 4000: World’s tallest tower will house 1 million people falls short from being a full answer to such a question. However, the costs and engineering complexity seem to approach those needed for construction of a space station housing this number of people.

I can’t see this monstrosity EVER being built - it would be too much of a terrorist target for a start and who in their right mind would ever want to live in such a place ?
you know peachuk, not everything man will create from now till the end of history can be counted as a terror target, it just can’t work like that…
as for who will live there? I saw people buy real estate in the ugliest, most desolate places, you can do much worse…