A United States Postal Service employee works outside a post office in Wheeling, Ill., Dec. 3, 2021. Four environmental groups that want the U.S. Postal Service to buy more electric delivery vehicles are suing to halt further purchases. The lawsuit, filed Thursday, April 28, 2022, in federal court in California, asks a judge to order the Postal Service to conduct a more thorough environmental review before moving forward with the next-generation vehicle program. (AP Photo/Nam Y. Huh, File)