Environment is sans frontières. Many of the current or emerging environmental problems are transnational and transboundary, necessitating legal integration, whether in the form of hard or soft laws, programs, policies or governance innnovations, such as ASEAN Dialogue Partners, or the United Nations Environment Programme consultations. All these are crucial to ASEAN.

ASEAN is part of the global order for environmental sustainability. It is a partner of the United Nations in the field of development. As the 1971 Stockholm Conference on the Human Environment and the 1992 “Earth Summit” at Rio De Janiero have made clear, we the peoples of the United Nations and of ASEAN alike, share one world, one atmosphere, one stratosphere. ASEAN's economic pillar requires integration to move Southeast Asia forward, and environment must move in tandem to prevent degradation of ecosystems for development to be sustainable regionally and globally.

This monograph examines the phenomenon of “integration through law” (ITL), or more particularly how the member states of ASEAN employ law as a means of regional integration, focusing in particular on how this process functions in the context of environmental conservation and sustainable development. The several chapters trace ASEAN's struggles to integrate environment within its own community and also with the global community. There are many concerns, not only in terms of the lack of institutional capacity and funding, but in the very nature of environmental problems. The environmental sciences have taught nations how complicated and interrelated human impacts are on the climate or ecosystems. States are left grappling with solutions. The search for environmentally sustainable progress is an ongoing, adaptive process, often without clear, immediate answers. This complexity is compounded by too many inputs that national sectors receive from diverse interdisciplinary studies, without any governance system to connect them.