The report on Japan is included in new book that has been published by the IUCN World Commission on Environmental Law, Ethics Specialist Group which also contains project reports on the United States, Australia, New Zealand, Netherlands, Russia, China, South Africa, South Korea, Kenya, Italy, , Bolivia, Thailand, and Uganda. The book is free and downloadable at http://cmsdata.iucn.org/downloads/iucn_eplp_86_advanced_copy.pdf
The book is:
Ethics and Climate Change
A Study of National Commitments
Electronic copies are free for download here.