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Originally posted by greenbean36191
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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My understanding is that there are about 19 different polar bear populations. One of which is in decline, due to hunting.
Putting an animal on the endangered species list because of what might happen in the future, seems silly to me. If you look at the rate of species extinctions, you could say the same for every animal including man.