Monetary sanctions have long been a part of the U.S. criminal justice system but have received increasing attention from the public as well as legal scholars and social science research in recent years. This essay describes initial findings from the Multi-State Study of Monetary Sanctions, a multi-method study designed to build on the prior research on legal financial obligations (LFOs) by examining the multi-tiered systems of monetary sanctions operating within eight states representing key regions of the United States (California, Georgia, Illinois, Minnesota, Missouri, New York, Texas and Washington). Our research explores the constantly changing legal environment and documents how the law is practiced on the ground. We expand on prior research by engaging a large and diverse group of people who owe legal debt and criminaljustice stakeholders. We augment these data with systematic court observations across different jurisdiction sizes and court levels. In doing so, we fill important gaps in the current understanding of U.S. systems of monetary and provide findings that can be used for guiding policy.

The land ice contribution to global mean sea level rise has not yet been predicted¹ using ice sheet and glacier models for the latest set of socio-economic scenarios, nor using coordinated exploration of uncertainties arising from the various computer models involved. Two recent international projects generated a large suite of projections using multiple models^2-8, but primarily used previous-generation scenarios⁹ and climate models¹⁰, and could not fully explore known uncertainties. Here we estimate probability distributions for these projections under the new scenarios^11,12 using statistical emulation of the ice sheet and glacier models. We find that limiting global warming to 1.5 degrees Celsius would halve the land ice contribution to twenty-first-century sea level rise, relative to current emissions pledges. The median decreases from 25 to 13 centimetres sea level equivalent (SLE) by 2100, with glaciers responsible for half the sea level contribution. The projected Antarctic contribution does not show a clear response to the emissions scenario, owing to uncertainties in the competing processes of increasing ice loss and snowfall accumulation in a warming climate. However, under risk-averse (pessimistic) assumptions, Antarctic ice loss could be five times higher, increasing the median land ice contribution to 42 centimetres SLE under current policies and pledges, with the 95th percentile projection exceeding half a metre even under 1.5 degrees Celsius warming. This would severely limit the possibility of mitigating future coastal flooding. Given this large range (between 13 centimetres SLE using the main projections under 1.5 degrees Celsius warming and 42 centimetres SLE using risk-averse projections under current pledges), adaptation planning for twenty-first-century sea level rise must account for a factor-of-three uncertainty in the land ice contribution until climate policies and the Antarctic response are further constrained.