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Many key global sustainability challenges are closely intertwined (examples are provided in the figure). These challenges include air pollution, biodiversity loss, climate change, energy and food security, disease spread, species invasion, and water shortages and pollution. They are interconnected across three dimensions (organizational levels, space, and time) but are often separately studied and managed. Systems integration—holistic approaches to integrating various components of coupled human and natural systems (for example, social-ecological systems and human-environment systems) across all dimensions—is necessary to address complex interconnections and identify effective solutions to sustainability challenges.

One major advance has been recognizing Earth as a large, coupled human and natural system consisting of many smaller coupled systems linked through …