The link between transnational environmental harm and national security
has attracted new attention due to the environmental crisis such as climate
change, nuclear accidents and, pollution. However, both domestic and
international environmental regimes are still tied to the unsuccessful and
unclear notion-sustainable development. The present author argues that
environment should be considered as a security matter for the effective
environmental protection. If, for example, a nation committed a serious
environmental harm and the effects spans borderlines, and the source nation
refuses to cooperate or compensate, would sustainable development still be an
appropriate measure? Then, what would be the victim stateʼs tool to protect
its own security? The present author first looks into the possibility utilizing
UN Security Council. But due to its limited legality and effectiveness in this
environmental matter the present author would like to propose a
non-traditional but a not-brand new method. This new method reflects two
new trends both from international law and security areas. First, this approach
clearly moves from the military focused security concept to broader security
concept. Second, this is also a shift from traditional international law to
transnational law. With these two new approaches, we will find a more suitable
answer both for securing national environmental security and for protecting
environment.