How did you get earlier access to Scientific American? That article is dated 4 days from now.
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I think they're giving their online readers a sneak peek to their physical October issue. 
Scientific American
It
Global warming is so rampant that some scientists say we should begin altering the stratosphere to block incoming sunlight, even if it jeopardizes ...
he ignores the embargo like a boss
or he lurks on Reddit
https://www.reddit.com/r/climatechange/comments/16mzrev/its_time_to_engineer_the_sky/
Scientific American
It
Global warming is so rampant that some scientists say we should begin altering the stratosphere to block incoming sunlight, even if it jeopardizes ...