As more and more development happens, more and more resources get used up. Increase in cultivation is an indicator of development.
The resources used for development may be renewable resources or non-renewable resources.
We have limited stocks of non-renewable resources that are lost forever once used.

Renewable resources get stored by nature in a period of time like groundwater which gets replenished by nature. Use of renewable resources faster than what nature can restore can lead to their scarcity.
If development continues at its present pace, there may be a time in future when we may run out of resources and no further development would be possible.

The concept of sustainability of development comes in here.
Sustainability of development involves finding ways for continuous development without the risk of running out of resources or causing irreparable damage to environment.

Sustainability of development would involve:
·         More efficient use of our existing resources
·         Finding fresh reserves of resources
·         And coming up with innovative ideas and technology to use new resources in place of conventional ones.