Page 133 - Health, Population and Environment Education 9

The concept of sustainable development emphasizes the maximum utilization of the
perpetual resources since such resources are never finished. The utilization of such
resources can substitute the utilization of non- renewable resources which will be used
up after the utilization of them for certain time. Perpetual resources are unlimited and
permanent sources of the materials which we need in our daily life and they are always
filled and are never emptied even after they are regularly and continuously utilized.
Maximum utilization of such resources like solar energy, wind energy and hydropower
can help to reduce the use of non- renewable resources which are limited and need to be
conserved for the forthcoming generation. This helps to minimize the problem of energy
crisis and makes the sufficient availability of the resources for comfortable life of mankind
all the time.

Fig: 1
Tides of ocean Sun Windmill

Renewable resources
Renewable resources are those resources which can be used repeatedly and replaced
naturally. Continuous or repeated utilization of renewable resources can cause the
depletion of the resources but they are refilled naturally so, are not finished. Fresh air,
fertile soil, fresh water, wild and aquatic life, plants, etc. are renewable resources.

Fig: 2
Forest Wild animals
Renewable resources should be utilized carefully and rationally and to the extent
which they can bear. Over exploitation of them causes their destruction and once they
are destroyed it becomes difficult to restore them. Human activities should be properly
planned so that the resources are utilized to meet the daily needs on one hand and are
saved for future on the other hand which is the main principle of sustainable development.

GREEN Environment Population and Health Education Book-9 133