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This Forum brings together river restoration researchers and practitioners to stimulate debate about the recent explosion of interest in North American beaver (Castor canadensis) and beaver-related practices in North American river restoration science and management. While the beaver is described in recent literature as a low-cost, high-impact ecosystem engineer capable of minimizing the impacts of wildfire, drought, flood, and disturbance across the continent, we consider the importance of shifting from a focus on prescriptive results—on what beaver get humans—and towards engaging with beaver in relational process. Through a set of provocations that highlight the potential damage beaver fixes pose for stream restoration, for beaver, and for the lands and waters they inhabit with humans and other beings, we invite settler river scientists, river restorationists, and river thinkers to question the increasingly taken-for-granted logic of beaver as isolated creature, ecosystem engineer, and river savior; defer to the millennia of theory about beaver and their relations on this continent, partnering with beaver and with the Native peoples who have known them longest; and reconnect beaver back to people, place, and time in support of lively, dynamic, diverse, flourishing river systems across the continent. 

Dominant forms of agricultural production in the U.S. Upper Midwest are undermining human health and well being. Restoring critical ecosystem functions to agriculture is key to stabilizing climate, reducing flooding, cleaning water, and enhancing biodiversity. We used simulation models to compare ecosystem functions (food-energy production, nutrient retention, and water infiltration) provided by vegetation associated with continuous corn, corn-soybean rotation, and perennial grassland producing feed for dairy livestock. Compared to continuous corn, most ecosystem functions dramatically improved in the perennial grassland system (nitrate leaching reduced ~90%, phosphorus loss reduced ~88%, drainage increased ~25%, evapotranspiration reduced ~29%), which will translate to improved ecosystem services. Our results emphasize the need to incentivize multiple ecosystem services when managing agricultural landscapes. 

The Renewable Fuel Standard (RFS) specifies the use of biofuels in the United States and thereby guides nearly half of all global biofuel production, yet outcomes of this keystone climate and environmental regulation remain unclear. Here we combine econometric analyses, land use observations, and biophysical models to estimate the realized effects of the RFS in aggregate and down to the scale of individual agricultural fields across the United States. We find that the RFS increased corn prices by 30% and the prices of other crops by 20%, which, in turn, expanded US corn cultivation by 2.8 Mha (8.7%) and total cropland by 2.1 Mha (2.4%) in the years following policy enactment (2008 to 2016). These changes increased annual nationwide fertilizer use by 3 to 8%, increased water quality degradants by 3 to 5%, and caused enough domestic land use change emissions such that the carbon intensity of corn ethanol produced under the RFS is no less than gasoline and likely at least 24% higher. These tradeoffs must be weighed alongside the benefits of biofuels as decision-makers consider the future of renewable energy policies and the potential for fuels like corn ethanol to meet climate mitigation goals.