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A variety of operations, such as public works, can affect the natural environment. To preserve the internationally valuable natural environment of Ogasawara when such operations are undertaken, it is necessary to prevent and minimize the burden the environment. With regard to the preservation of the environment of the Ogasawara Islands and the creation of the islands' landscapes, the Tokyo Metropolitan Government stipulates various policies to follow when undertaking various operations.

This document stipulates the items to be considered when executing public works, for the purpose of minimizing the impact that public works have on the environment and landscape of the Ogasawara Islands. These policies were established in August 2004.

This pamphlet is based on the policies for environmental considerations and explains points of caution and other information to operators and workers in an easy-to-understand format. Created in June of 2010.

This document stipulates as policy the appropriate considerations to take regarding the formation of the landscape when performing maintenance on facilities for the public and for public benefit. These policies were established in June 2004. With regard to planting, and in consideration of the islands' natural environment, this document maps out a list of recommended species of trees that will not harm Ogasawara's unique ecosystem.

The red-headed wood pigeon is an endemic species of bird whose habitat is the evergreen forests of the Ogasawara Islands. In addition to originally being a species of sparse numbers, the red-headed wood pigeon saw a drop in population due to the destruction by a typhoon of the trees whose fruits provided their food source. Their numbers also declined sharply because of other animals that preyed on them or competed with them for food. These facts were reported in a Tokyo Forestry Office survey report.
To prevent the bird's extinction, the Tokyo Bureau of the Environment coordinated with the Bureau of Construction (through the Ueno Zoological Gardens and other facilities) to launch a preservation breeding program in 2000.
The red-headed wood pigeon is designated as a national endangered species as per the Act on Conservation of Endangered Species of Wild Fauna and Flora and is also designated as a natural treasure as per the "Law for Protection of Cultural Properties".

The preservation and breeding project is currently moving forward, based on the national government's plan for a program for the conservation of the red-headed wood pigeon, and in collaboration with related organizations.

Contact Tokyo-to Kankyo-kyoku, Shizenkankyo-bu, Midorikankyo-ka, Shizenkoen-tanto, Natural Environment Division, Bureau of the Environment.
Phone: 03-5388-3548