The assessment of land use and land cover is an important activity for
cont- porary land management. Human land-use practices are the most
significant factors influencing environmental management at local,
regional, national, and global scales. In the past, environmental
policies have often reflected a reactive response to environmental
perturbations with management efforts focused on short-term, local-scale
problems such as pollutant abatement. Currently, environmental
management philosophy is evolving toward examination of critical
environmental problems over larger spatial scales and assessment of the
cumulative risk resulting from multiple problem sources. Today's
environmental managers, urban planners, and decision-makers are
increasingly expected to examine environmental and economic problems in
a larger geographic context that crosses national boundaries and
scientific disciplines. Secondly, cont- porary policy-makers have also
been challenged on how they view security. The conventional definition
of national security has been expanded to include environmental threats
resulting from resource scarcity and overpopulation and it is recognized
that environmental factors may have an impact in creating conflict and
world instability. Thus the working definition of security has been
broadened beyond relying on militaristic aspects alone and has evolved
to include the environment. In 1969, the North Atlantic Treaty
Organization (NATO) established the Committee on the Challenges of
Modern Society (CCMS) partly in response to examine the link between
environmental issues and security. CCMS was created for the purpose of
addressing problems affecting the environment of the member nations and
the quality of life of their citizens.