Here are several related links a friend sent me. I am sending him this post.
Letter in nature
http://www.indiaenvironmentportal.org.in/files/file/wildfires.pdf
http://www.wildfirepire.org/sites/default/files/hu_2010_tundra_burning_in_alaska_linkages_to_climatic_change_and_sea_ice_retreat.pdf
http://www.lter.uaf.edu/dev2009/pdf/1350_Tarnocai_Canadell_2009.pdf
NY Times article:
http://www.nytimes.com/2011/12/17/science/earth/warming-arctic-permafrost-fuels-climate-change-worries.html?pagewanted=1&ref=general&src=me
I have not read these yet, but was told the Alaska fires were very severe. Also, last year I saw something about a Russian scientist who was very concerned that large quantities of methane were being released from the Lena River delta emptying into the Arctic Ocean. There are those who believe that a giant methane burp caused a major extinction event about 55 million years ago.