Carbon capture: key decarbonizing tool or 'false solution?'

Polly Glover realized her son had asthma when he was nine months old. Now 26, he carries an inhaler in his pocket whenever he’s out and about in Prairieville, Louisiana, part of Ascension Parish.

“He probably needs to leave Ascension quite frankly,” Glover says, but he hasn’t because “this is his home and this is our family and this is our community.”

The parish is part of the 85-mile (137-kilometer) span between New Orleans and Baton Rouge officially called the Mississippi River Chemical Corridor, more commonly known as Cancer Alley. The region's air quality is some of the worst in the United States, and in several places along the corridor, cancer risks are much higher than levels considered acceptable by the U.S. Environmental Protection Agency.

Glover says the air is “terrible” where she lives, but there’s also great biodiversity — osprey, eagles, migratory birds, deer, rabbits, fish and alligators — among the region's lakes, rivers and wetlands. The environmental advocate has been working for 30 years to preserve the place she’s loved since childhood.

That’s why she is wary of anything that might make air quality worse or threaten wildlife — and her biggest fear now is that a $4.5 billion plant designed to capture climate-changing carbon and make clean-burning hydrogen fuel will actually do more harm to the Lake Maurepas basin.

The blue hydrogen energy plant is slated to be built and operated by Air Products and Chemicals, a multinational petrochemical company. The company says the plant will capture airborne carbon emissions created during production and put them safely underground — a process called carbon capture and storage.

“Sometimes I think people think you’re kind of bubbling this in at the bottom of the lake,” said Simon Moore, vice president of...