Funny, he really seemed interested in drowning NYC in his book 2312 (very good novel). I suspect he wanted to expand on the topic, besides the drowned city just

Funny, he really seemed interested in drowning NYC in his book 2312 (very good novel). I suspect he wanted to expand on the topic, besides the drowned city just being the setting for a few situations in the book. It might be worth comparing both descriptions of NYC to see what changed after his research.