Tag Archives: climate warming

Ian Stirling uses lifetime award to repeat flawed predictions for polar bears

It has been less than a month since the 2015 IUCN Red List assessment for polar bears was announced, which emphasized that the population trend for polar bears is unknown and that there is only a 70% chance that polar bear numbers could decline by 30% over the next 35 years.


Yet, in a press release announcing the Weston Family Prize for lifetime achievement in northern research (along with $50,000) to Ian Stirling for his work on polar bears (Newswire, December 9, 2015), Stirling is quoted repeating an out-of-date prediction:

“Dr. Stirling estimates that about half of the polar bear population around the circumpolar Arctic could disappear by 2050 to 2060, if climate warming continues as is currently projected…”

I’d have thought that if Stirling did not agree with the IUCN assessment prepared by his colleagues, he would have said so last month when the report was released to international fanfare. Instead, he seems to be deliberately ignoring the 2015 IUCN Red List assessment and pretending that the flawed predictions he had a hand in making are still plausible.  Continue reading

USGS promotes another flawed polar bear model: GHG emissions still “primary threat”

It’s still based on the same flawed ecological premise as all previous models – it assumes that sea ice was a naturally stable habitat until human-caused global warming came along. It also uses slight-of-hand maneuvers to correlate declining summer sea ice and declining polar bear population numbers.


Just because they keep repeating the same hype doesn’t make it true.
Continue reading

Polar bears have not been harmed by sea ice declines in summer – the evidence

PB  logo colouredThe polar bear biologists and professional activists of the IUCN Polar Bear Specialist Group (PBSG) continue to insist that since 1979 increasingly smaller amounts of Arctic sea ice left at the end of summer (the September ice minimum) have already caused harm to polar bears. They contend that global warming due to CO2 from fossil fuels (“climate warming” in their lexicon) is the cause of this decline in summer ice.

In a recent (2012) paper published in the journal Global Change Biology (“Effects of climate warming on polar bears: a review of the evidence”), long-time Canadian PBSG  members Ian Stirling and Andrew Derocher (both of University of Alberta) summarized their position this way:

“Climate warming is causing unidirectional changes to annual patterns of sea ice distribution, structure, and freeze-up. We summarize evidence that documents how loss of sea ice, the primary habitat of polar bears (Ursus maritimus), negatively affects their long-term survival”

I’ve spent the last year examining their evidence of on-going harm, but in addition, I’ve looked at the evidence (much of it not mentioned in the Stirling and Derocher paper1) that polar bears have either not been harmed by less sea ice in summer or have thrived in spite of it.

This is a summary of my findings. I’ve provided links to my original essays on individual topics, which are fully referenced and illustrated. You are encouraged to consult them for complete details. This synopsis (pdf with links preserved, updated; pdf with links as footnotes, updated) complements and updates a previous summary, “Ten good reasons not to worry about polar bears” (pdf with links preserved; pdf with a foreword by Dr. Matt Ridley, with links as footnotes).

Update 8 September 2013: to include links to my post on the recently published Chukchi population report; updated pdfs have been added above.

Update 22 January 2014: added figure comparing March vs. September sea ice extent using the same scale, from NOAA’s “2014 Arctic Report Card,” discussed here.
Continue reading