The human race is devolving due to the onset of technology and major advances in health science. The natural evolution laws proposed by Charles Darwin no longer apply today. Darwin proposed that 'survival of the fittest' was the major tenet of evolution. This is no longer the case as even those (I may seem a little harsh here) who are not 'fit to live' can be saved by modern medicine and can then reproduce.
This means that those genes and genetic material which do not give a survival advantage are still being perpetuated in human society.
Just so you understand just what 'survival of the fittest' means, here is an excerpt from the National Biology Dictionary and Wikipedia which gives a short summary: "Survival of the fittest" is sometimes claimed to be a tautology. The reasoning is that if one takes the term "fit" to mean "endowed with phenotypic characteristics which improve chances of survival and reproduction" (which is roughly how Spencer understood it), then "survival of the fittest" can simply be rewritten as "survival of those who are better equipped for surviving". While this is not exactly a tautology (we might imagine a benevolent deity or experimenter that would consistently favour the poorly adapted, and destroy well-adapted creatures, so that "survival of the fittest" might actually not occur), this is not a very informative statement: it simply reduces to a statement that the game of Life is not rigged in favour of the poorly adapted, which is not controversial. Furthermore, the expression does become a tautology if one uses the most widely accepted definition of "fitness" in modern biology, namely reproductive success itself (rather than any set of characters conducive to this reproductive success). This reasoning is sometimes used to claim that Darwin's entire theory of evolution by natural selection is fundamentally tautological, and therefore devoid of any explanatory power."
Hence the human race is actually devolving as unlike in the past, genetic material which does not lend a survival advantage is still being perpetuated. Whilst I do not advocate a global culling, there can be no doubt that as a species little has changed in the last 200o years