Environment is a concept with numerous dimensions. Accordingly , the indicators used to describe the state of the environment are equally varied. Two aggregate indicators were used in this study (Fig 3D). They are, first, the Environmental Systems Indicator, which is one of the five components of the Environmental Sustainability Index (ESI) by Esty, Levy, Srebotnjak, and de Sherbinin (2005), amd second, the Human Footprint Index by WCS/CIESIN (2002).