The world isn't producing fewer humans each year, it's just that some of the races are on the downward spiral and some aren't. This video is OK but the documentary Idiocracy is closer to the mark. "Smart" people have convinced themselves - and to an extent each other - that replenishing the species is somehow economically nonviable, ecologically unsound, and (this one always cracks me up) ethically selfish. Blacks, muzzies, and Asians, not (yet) hamstrung by such silly notions, continue to breed like rabbits.
Of course the fact that white people are literally working themselves to death to subsidize all the other races doesn't exactly help matters. Whites, being the creators of the blueprint to their own demise, have no one else to blame.
This, like everything else unpleasant in life, I blame on leftists.