As long as we have enough trees and plants... We can still breathe. Worst case, the planet becomes inhabitable and by that time we have an intergalactic war over "paradise" level planets. However, most of us will be likely dead by that time, so...
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I would think that even with all of these plants and trees, bacteria or underwater flora would provide the Earth more oxygen than anything else. I mean, some flora do grow underwater and Earth is 70% (iirc) ocean.
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Let's hope we don't figure out a way to make salt water into something properly drinkable, otherwise 70% will go to 30%.
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We already can but it is cheaper to draw water from resevoirs flowing from waste treatement facilities so that the water you drink has been through several people before.
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Well, it's too late now to stop drinking water. I am addicted to it. Please, Bungie.net support me through this horrible addiction.
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I know, right? It's debilitating! ;)