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I don't mean to be a smarty pants, but global warming doesn't necessarily mean everywhere will get hotter. It will mean the weather will get less predictable, more extreme (say colder in Perth), and that the average global temperature will rise. Some have mooted the point that increased amounts of global dust, due to human activity has already offset global warming with another phenominon coined Global Dimming.
Whatever the case, increases in atmospheric dust, whether intentional or as a by product of our activities will mean out pricey toys become less effective.
I only began the thread because I can't imagine National Geographic publishing tripe merely to boost sales. So I'm guessing that blasting sulfate particles into the upper atmopheres is a reasonably serious proposal.
Mike
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