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• S1.E1 ∙ Oceans: Into the Blue
• S1.E2 ∙ Deserts: Life in the Furnace
• S1.E3 ∙ Arctic: Life in the Deep Freeze
• S1.E4 ∙ Jungles: People of the Trees
• S1.E5 ∙ Mountains: Life in Thin Air
• S1.E6 ∙ Grasslands: The Roots of Power
• S1.E7 ∙ Rivers: Friend and Foe
• S1.E8 ∙ Cities: Surviving the Urban Jungle