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Anyone who thinks that the global human population can be reduced from its current level of around 6 billion within the next 50-100 years simply by controlling the human birth rate hasn't done the math.
And anyone who insists that it's imperative for the human population to be halved, quartered, or reduced to 1 billion or lower within the next 50 years is implicitly supporting "death control": the engineering of genocides and megadeath casualty counts- which is the only effective strategy for achieving such goals.
Find the stats, do the math. A couple of links with which to begin: http://www.census.gov/ipc/www/idb/worldpopinfo.html
http://dir.yahoo.com/Society_and_Culture/Issues_and_Causes/Population/Statistics/