MU KOH SURIN, Thailand — Ngui slips beneath the waves, his movements effortless and precise. He’s done this thousands of times, diving deep to find fish and crustaceans hiding beneath the coral shelves of the Andaman Sea. His catch today is different. A sheet of black plastic, snagged on a rock 50 kilometers (30 miles) … Continue reading Thailand’s last sea nomads confront a changing world