Global Warming - Where Do They Get The Numbers?

It seems they make them up as required. How many polar bears are there? No one actually knows, polar bears being notoriously hostile to census takers, but if a number is needed, one can be produced:

Researchers with the IUCN Polar Bear Specialist Group (PBSG) recently admitted to experienced zoologist and polar bear specialist Susan Crockford that the estimate given for the total number of polar bars in the Arctic was “simply a qualified guess given to satisfy public demand.”

Even a "qualified guess seems to have a lot of potential variation to it. They admit that their guesstimate seems to have been low by a factor of 30-50%.

Last "guesstimate" I saw was that polar bears have rebounded to over 50,000 and the Eskimos up in northern Canada are complaining of an overabundance of them, all hungry.