> This is not a problem of big cities as such but one that Beijing (and China more generally) has because it has only recently transitioned from a developing co

> This is not a problem of big cities as such but one that Beijing (and China more generally) has because it has only recently transitioned from a developing country. That's where it happens: Big cities in developing countries. > scalable to and sustainable for the projected 10 Billion population. Are ten billion sustainable at all? In Megacities? Will it be more sustainable to have them living mostly in Megacities? I don't believe those theories that these cities are more sustainable.