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I can't say I know anything about what the scientific literature says on DDT and birds, but I'd love to hear why you think it's a myth.
As for polar bears, from what I know (which isn't a lot) there's not enough global population data to tell whether numbers are increasing or decreasing. There are better records for some local populations and some seem to be decreasing. AFAIK none appear to be increasing. If sea ice continues to shrink and thin though, there's not much question they'll be in bad shape in the future. In any event, the fate of polar bears isn't evidence for or against anthropogenic warming.
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Lanikai, kahakai nani, aloha no au ia 'oe. A hui hou kakou.
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