Sustainability is very important for development because if all development activities are carried out without paying attention to environment and other natural factors then development itself will become a danger for mankind. For example, if forests are cut relentlessly then global warming will destroy everything on the Earth. In that scenario what would be the use of development. To achieve sustainability (a) we must be less dependent on non-renewable resources. (b) we must live according to natural conditions and use natural produce as far as possible.