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  1. null (Ed.)
    The knowledge of unsustainable human and Earth system interactions is widespread, especially in light of systemic environmental injustices. Systems science has enabled complex and rigorous understandings of human and Earth system dynamics, particularly relating to pollution of Earth’s land, water, air, and organisms. Given that many of these systems are not functioning sustainably or optimally, how might this field enable both rigorous understanding of the issues and experiments aimed at alternative outcomes? Here, we put forth a novel, multiscale systems science approach with three steps: (1) understanding the systemic issues at hand, (2) identifying systemic interventions, and (3) applying experiments to study the efficacy of such interventions. We illustrate this framework through the ubiquitous and yet frequently underrecognized issue of soil lead (Pb). First, we describe the systemic interactions of humans and soil Pb at micro-, meso-, and macroscales in time and space. We then discuss interventions for mitigating soil Pb exposure at each scale. Finally, we provide examples of applied and participatory experiments to mitigate exposure at different scales currently being conducted in New York City, NY, USA. We put forth this framework to be flexibly applied to contamination issues in other regions and to other pressing environmental issues of our time. 
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