An Argentine court ordered the government this week to prevent a British ship, the Pacific Swan, from carrying spent nuclear fuel into the country’s “jurisdictional” waters. The country’s Foreign Ministry said those waters extend about 12 nautical miles from the shore. But Greenpeace, which calls the ship’s cargo the “the equivalent of a floating Chernobyl,” said the waters stretch 200 miles from the shore, which is about where the ship was spotted earlier this week. The ship left France in the middle of last month with the goal of reaching Japan next month.