This funny meme has appeared in my Facebook Timeline several times recently.
I tried to research these numbers and found the following points of interest.
One, this article says nobody really knows how many polar bears there were in 1960. Al Gore was born in 1948, making that 7,000 number highly questionable.
Two, this article suggests 26,000 is the best median guesstimate for current populations, making that 30,000 number also suspect.