The concept of sustainability is greatly endangered in a world that is one-fourth rich and three-fourths poor, that is half democratic and half authoritarian, where poor nations are being denied equal access to global economic opportunities, where the income disparity between the richest 20% and the poorest 20% of the world’s population has doubled over the pass three decades,where one-fourth of humanity is unable to meet its basic human needs and where rich nation are consuming four-fifths of humanity’s natural capital without being obliged to pay for it.