Friday, 11 September 2009

I Don't Understand Polar Bears

I am having problems understanding this article in today's Daily Telegraph.
This graph shows the extent of the sea ice in the Arctic. As you can see it goes up in the winter and down in the summer. This year seems pretty consistent with the previous years this century.
This graph shows the daily mean temperature north of the 80th northern parallel, as a function of the day of year. The blue line is at what we call 0 Celsius. AS you can see there are only about 80 days of the year when the temperature gets above freezing.
This chart shows the status of the populations in 2005 and is the most recent I can find. Of the nineteen sub-populations five are declining, five are stable, two are increasing and there is insufficient data on the remaining seven.
What conclusion would you draw?

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