In this file photo provided by Paramount Pictures Classics, Al Gore is shown in a scene
from his documentary 'An Inconvenient Truth.' The film presents the former
vice president's case about the dangers of global warming. In November the
U.N.'s climate scientists issue a capstone report on where the planet is headed.
And in December envoys of almost 200 nations gather in Bali, Indonesia,
hoping for action to head off the worst of climate change.
(AP Photo/Paramount Classics, Eric Lee)