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Objectives. To empirically evaluate the relationship between presence of a state or federal prison and COVID-19 case and death counts. Methods. We merged data on locations of federal and state prisons and of local and county jails with daily case and death counts in the United States. We used a selection-on-observables design to estimate the correlation between prisons and COVID-19 spread, controlling for known correlates of COVID-19. Results. We found empirical evidence that the presence and capacities of prisons are strong correlates of county-level COVID-19 case counts. The presence of a state or federal prison in a county corresponded with a 9% increase in the COVID-19 case count during the first wave of the pandemic, ending July 1, 2020. Conclusions. Our results suggest that the public health implications of these facilities extend beyond the health of employees and incarcerated individuals, and policymakers should explicitly consider the public health concerns posed by these facilities when developing pandemic-response policy. (Am J Public Health. Published online ahead of print July 14, 2021: e1–e8. https://doi.org/10.2105/AJPH.2021.306352 )

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While the Clean Water Act's regulation of point source pollution has had a significant effect on water quality, non-point sources of pollution, especially animal agriculture in the US, remain a leading source of water pollution. This work studies the effectiveness of local manure management regulations on dairy farms in Wisconsin. Wisconsin represents an important location to study non-point agricultural pollution due to the economic importance of both small, non-point, dairy farms and a tourism industry based on clean water. Using bespoke hand collected regulatory data from Wisconsin counties we are able to estimate the effects of changes in local regulations on water quality outcomes. The results demonstrate that easily implemented and verifiable regulations such as nutrient management plans and certificates of use for storage facilities have significant short-term effects on water quality, while other less observable and difficult to implement regulations have no discernible effects in the short term effects. The work points to a number of potential policy levers to improve the management of non-point pollution in the dairy industry, as well as the challenges to measuring impacts of non-point source policies that work through slow-moving hydrologic processes.

The cattle industry in the Brazilian Amazon causes vast deforestation while producing at only one-third of the sustainable capacity. Slaughtering cattle at a younger age directly increases production per hectare per year, all else equal, and provides a potential path for sustainable intensification. Here we show that slaughter age is decreasing in the Amazon biome, but this increase in productivity varies across space and throughout the cattle supply chain. We characterize the properties and municipalities that have reduced slaughter age, providing insights into the incentives and barriers to this form of intensification. Most notably, reductions in slaughter age occurred in regions with low remaining forest cover and on properties with little current deforestation, suggesting that ranchers intensify via slaughter age as an alternative to deforestation. We then estimate how changing production practices to reduce slaughter age can reduce enteric methane emissions, accounting for production of additional feed. Our results indicate that reducing slaughter age through improved pasture and feed sources are a path to lower global GHG emissions from cattle production, particularly as beef is increasingly produced in developing countries with historically higher emissions. Yet in the Amazon, deforestation remains the leading source of GHG emissions, necessitating that any effort to reduce slaughter age must be coupled with strict enforcement of zero-deforestation policy. Our findings demonstrate the potential of policy limiting deforestation as a means to reduce both emissions from deforestation and enteric emissions from cattle.