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All humans and animals ‘will die out on Earth in a billion years’ due to ‘mass suffocation’ as oxygen levels collapse A DRAMATIC drop in Earth's oxygen levels will eventually kill off most life on Earth, according to a new study. Scientists think life as we know it could have about a billion years left before a 'mass suffocation' event sets in. Earth's atmosphere is currently about 21% oxygen, an element that's crucial to support the [...] Full Post Here - All humans and animals ‘will die out on Earth in a billion years’ due to ‘mass suffocation’ as oxygen levels collapse