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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.

During a historic hearing before the U.S. House Committee on Oversight and Reform on October 28, the executives of ExxonMobil, Chevron, Shell, BP, and the American Petroleum Institute (API), refused to admit to their decades-long climate disinformation campaign that is now well-documented in publicly available documents uncovered by journalists and researchers. If that weren’t enough, the executives continued to deny climate science under oath, albeit with a slight twist from their previous disinformation campaign. Instead of denying the science establishing that fossil fuels are driving the climate crisis, they’re now denying the science establishing the urgent need for a rapid transition away from fossil fuels. In other words, they’re still lying -- a strategy that was on full display in this blockbuster hearing.

Despite President Biden’s bold climate commitments at home and COP26, his administration and Congress have much more work to address climate change and to make climate justice a reality.

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.

Effective climate change mitigation depends critically on the ability to substitute electricity for gasoline as the primary transportation fuel and to substitute carbon-free fuels for fossil fuels as the country’s primary source of electricity. But the nation’s electricity transmission grid is woefully inadequate to accomplish these important tasks, and the U.S. regulatory system renders it impossible for regulators and clean energy advocates to implement the necessary expansion of grid capacity. Most sources of carbon-free electricity are located a long distance away from the places where most people live and work. Studies indicate that the United States can provide carbon-free electricity to major population centers only by adding transmission lines to the grid.

Late Friday, the House passed President Biden's infrastructure bill, the Build Back Better law. As The Washington Post aptly observed, the bill is the biggest climate legislation to ever move through Congress. It also attracted key support from some Republicans, which was essential to passing it in both houses of Congress. Biden is pushing for an even bigger companion bill, but the infrastructure bill is a huge victory in its own right. One major area of spending is transportation. Some of that goes for roads and bridges. But as The Washington Post reports, there's a lot of money for rail and mass transit.

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.