Actually, in about 500 million, there won't be enough CO2 left for photosynthesis[0]. The shelf life of complex life on Earth is probably closer the end than t

Actually, in about 500 million, there won't be enough CO2 left for photosynthesis[0]. The shelf life of complex life on Earth is probably closer the end than to the beginning. Still a lot of time left from our perspective, but we have to save ourselves -- and the legacy of complex life on Earth -- sometime. 0: https://en.m.wikipedia.org/wiki/Timeline_of_the_far_future https://en.m.wikipedia.org/wiki/Timeline_of_the_far_future Expand "Lists" and search for "photosynthesis".