In 2008, Al Gore (pictured) strode onto the stage at Denver’s football stadium to a hero's welcome, throwing his support behind Barack Obama to take on the "global climate crisis."
When Obama takes the stage this week, Gore will be nowhere in sight.
Gore's evolution over the past four years — from a central figure in the Democratic Party to a no-show at its biggest event — matches what has happened to the issue of climate change itself, which moved to the sidelines alongside its chief crusader.
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