What does sustainability of development mean?

What does sustainability of development mean? How can sustainable development be achieved?
**A .**Sustainability of development is an important issue because
(i) Suppose presendy, a particular country is quite developed. We would certainly like this level of development to go up further or adeast be maintained for future generations.
(ii) Since, the second half of the 20th century, a number of scientists have been warning that the type and levels of development are not sustainable.
(iii) Groundwater is an example of renewable resource. But if we use more than what is replenished by nature, then we would be overusing this resource.
(iv) Once the non-renewable resources would be exhausted, we won’t be able to use them in future. So, using the resources judiciously will help in maintaining the sustainability of development of our ecosystem