Norway's Prime Minister Erna Solberg, Agriculture and Food Minister Olaug V. Bollestad and Ghana's President Nana Akufo-Addo visit Svalbard's global seed vault in Longyearbyen. (Photo: Reuters)

OSLO: A vault in the Arctic built to preserve seeds for rice, wheat and other food staples contains one million varieties with the addition on Tuesday (Feb 25) of specimens grown by Cherokee Indians and the estate of Britain's Prince Charles.