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Prof. Alexandre explains what sustainability is and reveals that it actually has three complementary aspects: environmental, economic and social sustainability. Sustainability is more than you thought, and it has more to do with the lives of all people too. One caveat: Gro Brundtland was prime minister of Norway and not Iceland. Reference for the article mentioned in the text: Goodland, R. 1995. The concept of environmental sustainability. Annual Review of Ecology and Systematics 26: 1–24.