war, pollution, poverty, endangered species, global warming, famine, homelessness, child labour, famine, famine, war, pollution, poverty, child labour, endangered species, war, famine, pollution, war, crime, overpopulation, poverty, child labour, global warming, pollution, famine, war, drought, famine, deforestation, overpopulaiton, crime, unemployment, pollution, drought, scarcity

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