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Whoa! Wa?
Hi!
I doubt about the already passed time window. We can still invent some technologies that, so to say, neutralize the bad elements surrounding earth down to optimal values that suite our existance, and besides that, the mankind can run out of space or kill each other before or after that. Who knows? Also, what about the mankind consuming salt? Our ancesters (i mean, a really long time ago) probably didn't consume such large quantities of salt. A lot of it nowadays is produced from sea water (sea salt). We filter the salt, and it goes, a part of it at least, back into the ecosystem. So, the question is, how has the salt level in the water altered during some given period of time and what impact could it have to the Golf stream, or ice melting-regenerating, or other processes.
ps just a trip 8-)