At the present time the Earth accomodates  more  then  5  billion people. Half of which are undernourished. A total  of  4  million deaths  occureach  year  fro  starvation.  Mankind  has   finally realised the threat of an increasing population and has faced the fact that something must be done. The food-supply  increase  lags considerably behind the immense  growth  of  population.  Besides conditions for life grow steadily worse due to numerous facets of environmental pollution. And worst of all, today's man constently contributes to his own deadly crisis. We have got too many  cars, too many factories, too  much  sewage  and  carbon  dioxide,  too little water and food deficiency - all that can be  easily  taced to too many people. That is why many western scientists say  that our world is going through an ecological crisis which  will  mean the gradual destruction of the human race. Our scientists are not that pessimistic, although they do  think  that  man's  increased tampering with the world around him is posing a growing threat to the biosphere. It is not too late  to  forestall  what  could  be drastic and irreversible changes in the  environment  and  ensure that the world will be a healthy place for the present and future generations to live in.