A federal appellate court is set to hear oral arguments Monday in a civil rights lawsuit alleging a south Louisiana parish engaged in racist land-use policies to place polluting industries in majority-Black communities.

The Fifth Circuit Court of Appeals in New Orleans is reviewing a lawsuit filed by community groups claiming St. James Parish “intentionally discriminated against Black residents” by encouraging industrial facilities to be built in areas with predominantly Black populations “while explicitly sparing White residents from the risk of environmental harm.”

The groups, Inclusive Louisiana, Rise St. James and Mt. Triumph Baptist Church, seek a halt to future industrial development in the parish.

The plaintiffs note that 20 of the 24 industrial facilities were in two sections of the parish with majority-Black populations when they filed the complaint in March 2023.

The parish is located along a heavily industrialized stretch of the Mississippi River between New Orleans and Baton Rouge, Louisiana, known as the Chemical Corridor, often referred to by environmental groups as “Cancer Alley” because of the high levels of suspected cancer-causing pollution emitted there.

The lawsuit comes as the federal government has taken steps during the Biden administration to address the legacy of environmental racism. Federal officials have written stricter environmental protections and committed tens of billions of dollars in funding.

In the Louisiana case, U.S. District Judge Carl Barbier of the Eastern District of Louisiana in November 2023 dismissed the lawsuit largely on procedural grounds, ruling the plaintiffs had filed their complaint too late. But he added, “this Court cannot say that their claims lack a basis in fact or rely on a meritless legal theory.”

Barbier said the lawsuit hinged primarily on the parish’s 2014 land-use plan, which generally shielded white neighborhoods from industrial development and left majority-Black neighborhoods, schools and churches without the same protections. The plan also described largely Black sections of the parish as “future industrial” sites. The plaintiffs missed the legal window to sue the parish, the judge ruled.

Yet the parish’s land-use plan is just one piece of evidence among many revealing ongoing discrimination against Black residents in the parish, said Pamela Spees, a lawyer for the Center of Constitutional Rights representing the plaintiffs. They are challenging Barbier’s ruling under the “continuing violations” doctrine on the grounds that discriminatory parish governance persists, allowing for industrial expansion in primarily Black areas.

The lawsuit highlights the parish’s decision in August 2022 to impose a moratorium on large solar complexes after a proposed 3,900-acre (1,580-hectare) solar project upset residents of the mostly white neighborhood of Vacherie, who expressed concerns about lowering property values and debris from storms. The parish did not take up a request for a moratorium on heavy industrial expansion raised by the plaintiffs, the lawsuit states.

These community members “have tried at every turn to simply have their humanity and dignity be seen and acknowledged,” Spees said. “That’s just been completely disregarded by the local government and has been for generations.”

Another part of the complaint argues the parish failed to identify and protect the likely hundreds of burial sites of enslaved people by allowing industrial facilities to build on and limit access to the areas, preventing the descendants of slaves from memorializing the sites. The federal judge tossed out that part of the lawsuit, noting the sites were on private property not owned by the parish.

At its core, the complaint alleges civil rights violations under the 13th and 14th amendments, stating the land-use system in the parish allowing for industrial buildout primarily in majority-Black communities remains shaped by the history of slavery, white supremacy and Jim Crow laws and governance.

Lawyers for St. James Parish said the lawsuit employed overreaching claims and “inflammatory rhetoric.” St. James Parish did not respond to a request for comment.

The Supreme Court left in place Friday two Biden administration environmental regulations aimed at reducing industry emissions of planet-warming methane and toxic mercury.

The justices did not detail their reasoning in the orders, which came after a flurry of emergency applications to block the rules from industry groups and Republican-leaning states. There were no noted dissents.

The high court is still considering challenges to a third Environmental Protection Agency rule aimed at curbing planet-warming pollution from coal-fired power plants.

The regulations are part of a broader effort by the Biden administration aimed at curbing climate change that includes financial incentives to buy electric vehicles and upgrade infrastructure, and rules tightening tailpipe pollution standards for cars and trucks.

The industry groups and states had argued the EPA overstepped its authority and set unattainable standards with the new regulations. The EPA, though, said the rules are squarely within its legal responsibilities and would protect the public.

An EPA spokesperson said Friday the agency is pleased that the Supreme Court denied applications to stay the final methane and mercury rules. EPA believes the rule tightening methane emissions from oil and gas drilling will deliver major climate and health benefits for all Americans, while the mercury rule will limit hazardous pollution from coal-fired power plants, spokesperson Remmington Belford said.

The methane rule will build on innovative technologies and solutions that many oil- and gas-producing states and companies are already using or have committed to use, while the mercury and air toxics rule “will ensure that the nation’s coal-fired power plants meet up-to-date standards for hazardous air pollutants,” Belford said.

Both rules are firmly grounded in the EPA’s authority under the Clean Air Act, he said. The Supreme Court has shot down other environmental regulations in recent years, including a landmark decision that limited the EPA’s authority to regulate carbon dioxide emissions from power plants in 2022, and another that halted the agency’s air-pollution-fighting “good neighbor” rule.

The methane rule puts new requirements on the oil and gas industry, which is the largest emitter of the gas that’s a key contributor to climate change. A lower court previously refused to halt the regulation.

Methane is the main component in natural gas and is far more potent than carbon dioxide in the short term. Sharp cuts in methane emissions are a global priority — including the United States — to slow the rate of climate change.

The methane rule targets emissions from existing oil and gas wells nationwide, rather than focusing only on new wells. It also regulates smaller wells that will be required to find and plug methane leaks.

Studies have found that smaller wells produce just 6% of the nation’s oil and gas but account for up to half the methane emissions from well sites. The plan also calls for a phased-in requirement for energy companies to eliminate routine flaring, or burning of natural gas that is produced by new oil wells.

The states challenging the rule called the new standards “impossible to meet” and said they amounted to an “attack” on the industry.

The mercury rule, meanwhile, came after a reversal of a move by the Trump administration. It updated regulations that were more than a decade old for emissions of mercury and other harmful pollutants that can affect the nervous system, kidneys and fetal development.

Industry groups and conservative-leaning states argued emissions were already low enough, and the new standards could force the shuttering coal-fired power plants.