A variety of theories have been proposed over the years to explain why sexual reproduction may be more advantageous than asexual reproduction , and, for that matter, why sexual reproduction even exists at all. For years everyone accepted the general proposition that sex is good for evolution because it creates genetic variety, which, in turn, is useful in adapting to constantly changing and challenging environments. But it may give organisms a very different kind of edge.
Clearly, it is the time for a global effort to create every where on earth the conditions conducive to stabilizing human population. A set of projections can be arrived at regarding the maximum population that can be supported by the mother earth as a whole, or a particular region or a country, only in conjunction with availability of food, water, extent and nature of pollution, space, energy etc. apart from the climatic and even social and political changes that may take place. Population explosion is one of the major crises the nation is facing. Zero population growth (ZPG) holds the key to the well being and prosperity of the country.