Hi Alpha,
Sponge Planet is Kongjian's coinage, as was (to my knowledge) Sponge Cities. I profiled his Sponge Cities idea in Scientific American in 2018 (
https://ericagies.com/wp-content/uploads/2020/04/Sponge-City-Revolution-Gies-SciAm.pdf), and when I visited him in Beijing then, he showed me maps he had of China marking all kinds of ecological patterns, as well as human civilization patterns, and he told me he was thinking country-wide, and continent-wide. "It's time to expand the scale," he said.
Expanding the scale is something I hear from nearly all my sources for "Water Always Wins." Small Slow Water local projects, many thousands of them, is locally empowering. And every little bit helps, and the effect is cumulative. So when Kongjian asked me to be a coauthor for this Comment (and I ended up rewriting it because I write for Nature and know what they would agree to publish), I called them Slow Water projects, as I did in my book.
Best,