I have lived in Japan for the past seven years. There is a small back to land movement here. The reason it exists is simply because the countryside where I used to live is depopulated as there is a lack of interest from the new Japanese generation in farming. I used to have a kitchen garden when I lived in the rural area of Japan using land that farmers were happy to lend to me (too much land but too few people to farm it and keep it from going back to forest). As less rice is grown in Japan they have noticed native bird populations decreasing as well as many birds and reptiles species. This is because these animals use rice paddies as food sources for frogs, tadpoles, lizards, etc.
Ironically however the areas that have been hit by the tsunami and earthquake are actually the prime agricultural areas in Japan (areas North of Tokyo are where most of the produce comes from. Especially Akita, Aomori, Hokkaido, etc).
There is still a lot of land in Japan for agriculture as 80% of the nation is still mountainous forest and most of the people are squeezed into cities. You might be interested in this clip.
http://www.youtube.com/watch?v=VaOfrRopXIs (not me, but other people are in a similar situation to what I was).
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