This planet already has 6 billion souls on it. There exists limited resources to feed the ever-increasing population. The decrease in population is not something to be alarmed, but a phenomenon, in which men find comfort. Decrease in population does not indicate looming extinction, but the human race finding equilibrium with its environment. There is no global conspiracy to poison the human race. There may be some deluded idiots who imagine themselves saviors of the planet, but there will always be idiots who think they are anointed to "reform" society. Decrease in birth rate is merely a consequence of socioeconomic realities of developed societies. The reason for pre-antibiotic era societies to have bred like rabbits is due to high infant mortality rate and death rate from infections. In the modern era of easily accessible medical care, at least in the rationally governed societies, there is no reason to birth a litter of young.