UN Secretary General Antonio Guterres raised concerns Thursday that a concrete dome built last century to contain waste from atomic bomb tests is leaking radioactive material into the Pacific. Speaking to students in Fiji, Guterres described the structure on Enewetak atoll in the Marshall Islands as "a kind of coffin" and said it was a legacy of Cold War-era nuclear tests in the Pacific... ...The "coffin" is a concrete dome, built in the late 1970s on Runit island, part of Enewetak atoll, as a dumping ground for waste from the nuclear tests. Radioactive soil and ash from the explosions was...