Definitions

Built Capital:
Built capital is the human-made infrastructure that is constructed or retrofitted to suit community needs.  Examples include:  houses, utility and transportation infrastructure, factories, markets, shops, and schools.

Human Capital:
Human capital is the aggregation of the knowledge, skills, and abilities possessed by the members of the community that enable members to contribute to the creation, development, and sustenance of the community. It is actively acknowledged that such knowledge and skills may be either innate or acquired, and that each member brings a unique and valuable contribution to the total of human capital.

Social Capital:
Social capital is “the institutions, relationships, and norms that shape the quantity and quality of society’s social interactions” (http://www.worldbank.org/poverty/scapital/whatsc.htm).  Social capital be thought of as the glue that holds people and society together.  Having a strong base of human connections is correlated with the degree of sustainability that can be achieved through a particular development path.  Social capital is expressed not only through interpersonal relationships within a society, but also through participation in governance, and the various overlapping interactions that form human lifestyles.

Natural Capital:
Natural capital is all of the natural infrastructure of the planet, which produces ecosystem goods and services that contribute to the well-being of human and other species.  This includes: mineral and biological raw materials, renewable energy and fossil fuels, waste assimilation capacity, and vital life support functions provided by functioning ecosystems.