Nevada sues over Colorado River cuts; study links 122 firms to water loss

Nevada has filed a federal lawsuit challenging the Trump administration's plan to cut Colorado River water deliveries to lower-basin states by roughly 20% over the next two years, marking the first legal salvo in what could become a protracted battle over the shrinking river. The suit, filed Monday in federal district court, argues the plan unfairly burdens Nevada, Arizona, and California while sparing upper-basin states Colorado, Utah, New Mexico, and Wyoming from mandatory cuts Source: CNN. Nevada Governor Joe Lombardo said southern Nevada could lose more than 70% of its already meager allocation, calling the plan "fundamentally flawed" Source: CNN. The Interior Department did not respond to requests for comment Source: CNN.

The dispute

The lawsuit highlights a core disagreement: upper-basin states argue they have already suffered from drought and should not bear further cuts, while lower-basin states insist everyone must share the burden Source: The Guardian. Arizona has also warned it may sue Source: LA Times. Legal experts predict the case could reach the Supreme Court, complicating negotiations among the seven states Source: LA Times.

Climate attribution

Separately, a new study in Communications Earth & Environment finds that 122 "carbon majors"—the world's largest fossil fuel and cement producers—are responsible for about half of the West's climate-driven water losses over the past decade. The study attributes a 9 trillion gallon reduction in April snowpack, roughly Lake Mead's capacity, and a 2.4% increase in irrigation demand to these companies' emissions since 1950 Source: Gizmodo. The authors, including scientists from the Union of Concerned Scientists, call for accountability, citing BP, Chevron, ExxonMobil, and Shell as examples Source: Gizmodo.

What's next

The lawsuit and study underscore the escalating tensions over water in a warming West. While the legal challenge proceeds, the river's reservoirs—Lake Mead and Lake Powell—remain at record lows, and the future of water sharing hangs in the balance Source: CNN, Gizmodo.