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Sustainability and efficiency of water-land-energy-food nexus based on emergy-ecological footprint and data envelopment analysis: Case of an important agriculture and ecological region in Northeast China

EngineeringNortheast ChinaEco-efficiencyImportant AgricultureSustainable AgricultureAgricultural EconomicsSustainable DevelopmentEnvironmental FootprintEmergy AnalysisEnvironmental EconomicsNexus ThinkingWater-energy-food NexusAgriculturePublic HealthEmergy-ecological Footprint