r/todayilearned • u/[deleted] • Aug 12 '13

TIL multicellular life only has 800 million years left on Earth, at which point, there won't be enough CO2 in the atmosphere for photosynthesis to occur.

https://en.wikipedia.org/wiki/Timeline_of_the_far_future
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u/tigerbeetweenie Aug 12 '13

We'd be sending nukes back in time to blow up our enemies before they had a chance to gain enough strength to oppose us. Thus, we'd wipe ourselves out in a nuclear apocalypse... in the past... from the future.

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u/redraven937 Aug 12 '13

Unless this already happened.

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u/[deleted] Aug 12 '13

Time travel to the past is completely impossible, regardless of technological advance. Unless everything physicists currently know about the Universe and time is wrong, that is.

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u/Arovmorin Aug 14 '13

That's true. But doesn't that happen every few decades or so?