What is the best method of checking world population-a dangerous phenomina-by persuation or.....?

we are more than 700 crores and increasing day by day. earth area is less than the oceans. how to accommodate such a vast population, besides the consumption of things is simultaneously increasing. govts. are aware, uno is aware but the measures are meagre. China was in forefront to check, but as is understood they also want population increase. the solution has to come out, that is to be known.........?