When a judge in Louisiana struck down the air permits that Formosa Plastics needed for its new project in St. James Parish in 2022, it seemed like the long battle to block construction of the largest plastics manufacturing complex in the country was finally over. But late last week, a state appeals court reversed that decision, clearing the way for the Taiwanese chemical giant to start building its $9.4 billion Sunshine Project along a stretch of land on the lower Mississippi River known as Cancer Alley, where hundreds of chemical plants spew toxic pollution into the air of predominantly Black communities.