นักวิจัยเจาะแผ่นน้ำเเข็งอายุหกพันปีศึกษาประวัติภาวะโลกรัอน

Scientists are drilling down through kilometers of Arctic ice to read the world's climate history as a way to predict the planet's future. VOA's Steve Baragona visited Greenland to see what you can learn from a hole in the ice.