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Abstract Co‐production is becoming an increasingly important approach to facilitating integrated climate, environmental, social and earth systems research to achieve societal impact. Across the research and science‐policy ecosystem, there are multiple indicators of its growing prominence as means to engage the public and generate research that is more likely to address real‐world problems and community priorities. Power plays a key role in co‐production, as power imbalances can affect participation, decision‐making, and the distribution of benefits. Addressing power imbalances, through a focus on equity in co‐production, helps to ensure past harms are addressed and participants have the resources and opportunities to contribute effectively. This special issue includes articles that explore equity in co‐production. Articles describe the results of projects that used co‐production approaches, social scientific findings that can inform equitable co‐production, and some that do both. Across the submissions, inclusive decision‐making, strengthening capacity at multiple levels, and fostering trust and respect were key themes. The collection provides practical lessons and future directions to advance equity in co‐production processes, meeting the urgent demand for more inclusive and impactful environmental science practices. 

Abstract. Sít' Tlein, located in the St. Elias Range, which straddles Alaska's Wrangell–St. Elias National Park and Kluane National Park in the Yukon, is the world's largest piedmont glacier. Sít' Tlein has thinned considerably over 30 years of altimetry, yet its low-elevation piedmont lobe has remained intact in contrast to the glaciers that once filled neighboring Icy and Disenchantment bays. In an effort to forecast changes to Sít' Tlein over decadal to centennial timescales, we take a data-constrained dynamical modeling approach in which we infer the parameters of a higher-order model of ice flow – the bed elevation, basal traction, and surface mass balance – with a diverse but spatiotemporally sparse set of observations including satellite-derived, time-varying velocity fields; radar-derived bed and surface elevation measurements; and in situ and remotely sensed observations of accumulation and ablation. Nonetheless, such data do not uniquely constrain model behavior, so we adopt an approximate Bayesian approach based on the Laplace approximation and facilitated by low-rank parametric representations to quantify uncertainty in the bed, traction, and mass balance fields alongside the induced uncertainty in model-based predictions of glacier change. We find that Sít' Tlein is considerably out of balance with contemporary (and presumably future) climate, and we expect its piedmont lobe to largely disappear over the coming centuries. If warming ceases, and surface mass balance remains at 2023 levels, then by 2073 (2173) we forecast a mass loss (expressed in terms of 95 % credible interval) of 323–444 km3 (546–728 km3). If instead surface mass balance continues to change at the same rate as inferred over the historical period, then we forecast a 2073 (2173) mass loss of 383–505 km3 (740–900 km3). In either case, the resulting retreat and subsequent replacement of glacier ice with a marine embayment or lake will yield a significant modification to the regional landscape and ecosystem.