In ecological terms, sustainability refers to how biological systems remain diverse and productive.
Self-sustaining, healthy wetlands and forests are examples of sustainable biological systems, absent human intervention. In legal terms, sustainability involves the survival of systems and processes through our laws, regulations and policies.
The fundamental principle for our environmental sustainability is sustainable development within our legal framework. This includes inter-connected disciplines involving ecology law, economics, politics, planning and culture.
Sustainability requires our understanding of sustainable development and environmental science.