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Confirming expectations, the Supreme Court on Monday unanimously denied Mississippi’s claim that Tennessee is stealing its groundwater. If Mississippi wants to pursue its groundwater battle with Tennessee, it will have to file a new complaint with the court asking for an equitable apportionment of the Middle Claiborne Aquifer, which lies beneath Mississippi, Tennessee, and other states.

Less than two months after oral argument, in its first interstate groundwater case, the Supreme Court unanimously decided that Mississippi must rely on a doctrine known as equitable apportionment if it wants to sue Tennessee over the shared Middle Claiborne Aquifer. In an opinion by Chief Justice John Roberts, the court squarely rejected Mississippi's claim that Tennessee is stealing Mississippi's groundwater, noting that it had "'consistently denied' the proposition that a State may exercise exclusive ownership or control of interstate waters." As expected, the court's opinion in Mississippi v. Tennessee is short -- 12 pages, half of which recount the long history of the case. Nevertheless, in this first opinion about states' rights to interstate aquifers, the court made three important decisions that are likely to guide future interstate disputes over natural resources.

Our system of environmental regulation divides up regulation of a single substance based on each of its environmental impacts. Thus, the regulatory system sees the "trees," not the "forest." That muddies the waters when we are talking about regulatory priorities, strategies, and long-term goals. It can also lead to framing issues in ways that may weaken environmentalist arguments, since the various harms of a substance or activity get fragmented into different silos. Fossil fuels are a case in point.

Our society has finally reached a turning point on climate. I’m not referring to the “point of irreversibility” about which the United Nations warns us: In nine short years, the cascading impacts of climate change will trigger more and greater impacts -- to the point of no return. Rather, we have reached the turning point of political will for climate action. There is no going back to climate passivity or denialism. Choosing to electrify and greenify is a progressive agenda, a mainstream agenda, and an industry agenda -- though all of these agendas differ.

Mississippi v. Tennessee is not only the Supreme Court’s first oral argument of the 2021-22 term, but it is also the first time that states have asked the court to weigh in on how they should share an interstate aquifer. The court’s decision could fundamentally restructure interstate groundwater law in the United States for decades -- or the case could be dismissed immediately on the grounds that Mississippi has failed to allege the proper cause of action.

Stormwater is growing problem in the Chesapeake Bay watershed, creating toxic runoff and flash flooding. The Maryland Department of Environment has the opportunity to protect people, but it hasn't yet.

Maryland is home to more than 1,000 industrial facilities, including landfills, auto salvage yards, hazardous waste treatment, storage sites, and various types of manufacturing and processing plants. When it rains or snows, toxic pollution often runs off these facilities and enters nearby waterways and groundwater resources, negatively impacting aquatic life, nearby communities, and drinking water sources. The problem -- known as industrial stormwater pollution -- is dire in Maryland. More industrial facilities are being built in the state, and precipitation intensity is increasing more quickly in the Chesapeake Bay region than elsewhere in the United States, threatening public and environmental health. Low-income people and communities of color are at heightened risk.

On August 29, Hurricane Ida pummeled Louisiana’s coastline with winds as high as 150 miles per hour and a storm surge of up to nine feet, flooding communities and destroying homes. The Category 4 storm displaced thousands of people and left 1 million without power -- all as the coronavirus surge overwhelms hospitals across the state. Amid this chaos, Louisianans faced yet another hazard -- the risk of exposure to toxic pollutants from explosions, flares, and accidental releases at disabled, damaged, or flooded industrial facilities.

The U.S. Senate faces a long to-do list when it reconvenes next month. U.S. Rep. Gerry Connolly, D-Fairfax,  wants to be sure an important but fairly obscure environmental health bill makes the list.