Japanese cities' lack of seasonal balance due to a man-made biodiversity

[DoctorP]

But Okinawa is hardly Japan.

I have lived in many areas of Japan. I, myself, do not refer to Okinawa as Japan, I will call it Okinawa. It is much different than the rest of Japan. You are the one whose view has been limited to a confined area.

Most Japanese live in big cities, not in the countryside.

Actually many have homes in both areas. They live in the city during the work week and escape during the weekends!

Why the hell would I criticise the way nature is in a specific part of the world ? What matters is how humans interact with it and control it. The Japanese cut their beautiful forests to plant "sugi", then put concrete on every mountain, hill, river bank or coast that can come into contact with people,

I think that the concrete you refer to is used to prevent soil runoff, and damage to the environment (at least in the countryside). You say that they cut their forests, but I know of many forests that have never been touched.