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Sustainability can be defined as the ability to maintain healthy environmental, social and economic systems in balance, indefinitely, on a global and local scale.
The spheres of sustainability can be conceptualised as having a nested relationship (Figure 1), with the economy and society a subset of the environment.
Culture is often included as a fourth circle or a subset of society.

The economy is much broader than the regular monetary economy, and includes:

  • an exchange of goods and services within and between communities, with
  • a focus on the equitable distribution of scarce resources
  • at a sustainable scale.
  • Water Harvesting
    • Reuse of bath and shower water for toilets
    • Rain and storm water
  • Energy Harvesting
    • Solar Panels
  • LED Lighting
  • Packaged Sewage Treatment Plant
  • Recycling
  • Compost
  • Vegetable
  • Vegetation