This week, the 2nd Circuit U.S. Court of Appeals in New York ordered the Environmental Protection Agency to write new rules for the ballast water in ships.
Four environmental groups sued the EPA over its current ballast water rule.
Invasive species can get into the Great Lakes in ballast water. Salties are ships that cross the ocean, and lakers are ships that travel only within the Great Lakes. In the decision, the judges criticize the EPA for exempting lakers from certain regulations.