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The Biden administration announced on Monday that it would not meet a February target date to issue a revised definition of federal jurisdiction under the Clean Water Act. It still plans to issue a revised definition later in the year. That sounds like a very technical issue. But it actually determines the extent to which the federal government can prevent water pollution and protect wetlands across the nation. The Biden proposal basically calls for case-by-case decisions about federal jurisdiction. It's also the latest chapter in one of the most snarled-up regulatory issue of our times.

In an era when most Supreme Court opinions are sharply divided, recently the high court unanimously rejected Mississippi’s claim against Tennessee in a long-running dispute over the groundwater that lies beneath both states in a common aquifer.

Across the country, hundreds of thousands of aboveground storage facilities containing hazardous chemicals — such as arsenic, formaldehyde, and trichloroethylene — are not subject to state or federal rules designed to prevent and mitigate spills. These storage tanks sit along our industrialized waterfronts and at agricultural supply depots in our rural communities, threatening the health and safety of nearby residents, many of whom are low-income people of color. It's beyond time for the U.S. Environmental Protection Agency and states like Virginia to take action.

Carbon capture use and storage is at the center of the national climate policy debate, promoted by the oil and gas industry, the private sector, and even some environmental organizations as a solution to the climate crisis. The federal infrastructure package that President Biden recently signed into law appropriates more than $10.3 billion for the nationwide buildout of carbon capture infrastructure. The fossil fuel industry is targeting Louisiana as an emerging hub for carbon capture, mainly because of the large concentration of industrial facilities that emit carbon dioxide in the stretch of land between New Orleans and Baton Rouge. While Louisiana must move quickly and aggressively in pursuit of climate change solutions, deploying carbon capture to reach net-zero emissions is not the answer. A new Center for Progressive Reform policy brief has more on the subject.

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.