Concerned by the millions of refugees, migrants, displaced persons and those struggling to hold onto the little that they have, Brazilian Sebastião Salgado photographed in 41 countries in 6 1/2 years. Why? "My hope is that, as individuals, as groups, as societies, we can pause and reflect on the human condition at the turn of the millennium," he writes. "In its rawest form, individualism remains a prescription for catastrophe. We have to create a new regimen of coexistence."