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In this age, large demographic shifts will have many negative effects on the quest towards sustainability. Any rate of growth that results in an overall population gain is unsustainable. Therefore, immigration must be viewed in the context of sustainability ethics, which are based on indefinite use of the planet by the human population. Most countries are already exceeding _lifeboat capacity, which immigrants recognize even if the country s leaders and citizens do not. The major question of sustainability ethics is how this regrettable situation can be resolved before too many _lifeboats begin to sink.