Sustainability, more recently referred to as ‘sustainable development', came from the idea of integrating economic development and environmental protection. The concept is based on the recognition that the earth's resources are finite and through a better understanding of the global environment, steps should be taken to halt and reverse the negative impacts of human development." Development that improves the quality of life, both now and in the future, in a way that maintains the ecological processes on which life depends" It requires at least four broad objectives of ecological, social, cultural and economic sustainability.