Living underwater is about to become a lot easier. The US Navy has developed a way to clear carbon dioxide from air using the most convenient substance imaginable-seawater. "Removing CO_2 is very important," says Gareth Toft, a research scientist with the Submarines Atmospheres Group at the British defence lab Qinetiq-formerly the Defence Evaluation and Research Agency-in Hampshire. "With levels over 5 per cent you're in immediate trouble. At 10 per cent it's fatal."
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