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ib_geog2009 Extreme environments Opportunities and challenges for management Sustainability mountains UNEP
drought arid arid_agriculture extreme_environments population_density
indigenous population periglacial ib_geog2009 extreme distribution
ib_geog2009 extreme distribution periglacial
exam-question ib_geog2009 extreme glacial
periglacial_manage ib_geog2009 periglacial