Earth
Mars-like ice rediscovered in Hawaii volcano, but might not last
Ice was mysteriously found below the crater of Hawaii鈥檚 Mauna Kea 50 years ago, but was soon forgotten. Alice Klein joins a search for clues to ice on Mars
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Ice was mysteriously found below the crater of Hawaii鈥檚 Mauna Kea 50 years ago, but was soon forgotten. Alice Klein joins a search for clues to ice on Mars
More than 55 countries have ratified the UN鈥檚 climate agreement, meeting the first of two thresholds needed for it to come into force