The ecological impacts of extreme weather, a national “climate park” in the New Jersey Meadowlands, and engineered nanoparticles that target groundwater pollutants are among the 13 projects funded by the Princeton Environmental Institute (PEI) as part of its Water and the Environment Grand Challenge program. Totaling $1.01 million, the newly awarded undertakings explore an array of topics in multiple disciplines, from wastewater emissions and the role of climate change in spreading plant diseases, to nitrogen-hungry bacteria and a plan to capture carbon dioxide while mitigating mining runoff. The projects run from 2019 to 2021.