In absolute numbers there are more slaves today than in any moment in history of humanity.
Speciesist and anthropocentric mentality that is reinforced by world's most popular ideologies - shallow postmodernism, christianity and other religious ideologies - is what keeps this stuff alive.
It is a shame war is necessary to force people to abandon congitive dissonance and start making a better place of this world. At least we in first world countries have all the time to make the change and be the role model, but we seem to be doing business-as-usual, at least the majority of us.