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Despite what some conservative blowhards would have you believe, Al Gore's film isn't a stern 90-minute piece of propaganda on how we humans are causing our own extinction.  Yes, he does illustrate how dire things could become if carbon dioxide emissions into the atmosphere continue to rise exponentially, but he expresses a lot of optimism for our capacity to address the problem, if only we can summon the necessary political will.  The film's website contains lots of practical tips on reducing our carbon footprint in the course of our daily lives, most of which I can comply with except for the one about planting a tree.  Here in downtown, we are sorely lacking in tree-lined boulevards, so maybe I can start a letter-writing campaign to urge the City Council to green up the neighborhood.