The concept of sustainability continues to evolve. However, the core elements feature in most definitions is
• Sustainability is concerned about with the future and ability to maintain the certain values, assets or capabilities over the long term.
• Sustainability involves decisions that address the interaction between environmental, social and economic domains.
• Sustainability requires choices considering equity within society and across generations.

sustainable cities??

•  Rapid growing population will be settled largely in existing urban areas. Effective and timely strategic planning is needed to reduce the pressure on natural resources associated with the growth  of the urban areas and to ensure that infrastructure and services meet the needs of the population.
• Development patterns in our outer urban areas have resulted in increased car dependence and travelling times, and a lack of local job opportunities for residents. Residents in outer urban areas also have lower access to services, such as health care, compared to those living in inner urban areas.
• In population growth, our challenge is to create cities that are liveable, competitive, productive, equitable and environmentally sustainable. The stability of  cities, their functioning infrastructure, world-class amenities, education and healthcare, and low crime rates make them the envy of the world. 
• At the same time, Malaysia cities are lagging behind in some aspects of sustainability, particularly when it comes to energy consumption, car dependence and equity, with a stark and growing divide between the opportunities available to residents of the inner suburbs and those available to residents in outer urban areas.
• Cities have absorbed 60% of the population growth over the last 40 years. Our cities are home to a large and growing proportion of the population, with three quarters of Malaysians living in the nation’s major cities – those with over 100,000 people. 
• This growth has taken place within a relatively small area, as urban development and other intensive land uses occupied only 0.4% of  total land area.
• Cities are key contributors to the productivity, liveability and sustainability of society as they are home to a wide variety of services and the source of major cultural, social, economic and educational opportunities. Cities generate around 80% of our gross domestic product and employed 75% of workforce.