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No one can say it isn't humanity and no one can say it is, at least not yet - humans have, frankly, not been keeping records long enough to chart the progressions as accurately as is required to make those sorts of claims.
Here's the kicker, though: no matter if it's caused by humanity or not, one's actions can still be reprehensible if, say, one throws recyclables into the trash or drives unnecessarily. Excessive driving, or overpopulous groups of people driving regularly, causes inversions and ground-level pollution and lung disease and all kinds of problems. It also consumes nonrenewable resources... the list goes on.
The cry that global warming is a natural process, or the cry that global warming is because of the damn dirty West... whatever. It doesn't matter on the ground, because there are other reasons besides global warming to practice healthy renewable living.
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The phrase "we (I) (you) simply must---" designates something that need not be done. "That goes without saying" is a red warning. "Of course" means you had best check it yourself. These small-change cliches and others like them, when read correctly, are reliable channel markers.
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