The prime ministers of two small island nations that face ongoing impacts from rising sea levels appeared at legal hearings at an international court in Germany on Monday, and seek an advisory opinion on the obligations of countries to combat climate change. Prime Ministers Kausea Natano of Tuvalu and Gaston Browne of Antigua and Barbuda gave evidence at the International Tribunal for the Law of the Sea, which will consider whether carbon emissions absorbed by the ocean should be considered marine pollution, and what obligations nations have to protect the marine environment.