Obama’s trip to Alaska comes amid the latest extreme weather fueled by global warming. Tropical Storm Erika battered the Caribbean island of Dominica late last week, killing at least 20 people and leaving 31 missing. Dominica Prime Minister Roosevelt Skerrit said the island had been set back 20 years by the damage, which he described as “monumental.” Scientists have warned climate change will cause tropical storms like Erika to intensify.