(the following our definition is for ENVIRONMENTAL sustainability, we do not cover social, economic [or political] sustainability themes in this definition)
Our DEFINITION of the green city sustainability model is one which addresses climate change as completely as possible. There are seven major ideas to be addressed in DEVELOPING parameters that define a sustainable city. These components can easily be sub-divided in order to provide a comprehensive description of sustainability. This definition goes beyond the basic idea that sustainability means improving the planet's ecological health and leaving a better world for our children. Sustainability is commonly seen as the obligation to "meet present needs without compromising the ability of future generations to meet their needs".
This definition provides a brief picture of the truth, but it is well worth going deeper, into the building blocks, the science, of sustainability. The seven building blocks of sustainability are: ecology/ wildlife protection, green building, resource management, energy efficiency, renewable energy (including energy storage*), sustainable mass transportation and, probably the most vital component, urban planning. The components can easily be combined, as well:
Renewable energy and resource management can be placed in a single category, energy & resource management. All energy comes from resources, and all resources require energy to turn into building materials and/ or material goods. Mass transit, urban planning, and green building can be put in a category called sustainable planning and design. These three components can also simply be added to renewable energy and resource management, forming five components which would then make up the energy & resource management category.