The views expressed by the Neo-Malthusians, environmentalists and radical ecologists are explained below:

(i)They believe that for a happy and peaceful social life proper balance between population and resources is a necessary condition.

(ii)According to these thinkers, the gap between the resources and population has widened after eighteenth century.

(iii)There have been marginal expansion in the resources of the world in the last three hundred years but there has been phenomenal growth in the human population.

(iv)Development has only contributed in increasing the multiple uses of the limited resources of the world while there has been enormous increase in the demand for these resources.

(v)Therefore, the prime task before any development activity is to maintain parity between population and resources.