Skeptics

Sallie Baliunas (group 1)
Frederick Seitz (group 2)
Steven Milloy (group 3)
Fred Singer (group 4)
Patrick Michaels (group 5)

Source Set 1. Top ten sources in Google returns for "climate change" (excluding Youtube, Google News, etc.)

http://en.wikipedia.org/wiki/Climate_change
http://www.epa.gov/climatechange/
http://www.ipcc.ch/
http://topics.nytimes.com/top/news/science/topics/globalwarming/index.html
http://www.guardian.co.uk/environment/climate-change
http://climate.nasa.gov/
http://www.climatechange.gov.au/
http://www.newscientist.com/topic/climate-change
http://www.unep.org/climatechange/
http://www.bom.gov.au/climate/change/

Source Set 2. Climate change blogs network - ranked actor list by page (top 15 actors excluding wordpress.org and twitter.com)

http://realclimate.org
http://scienceblogs.com
http://tamino.wordpress.com
http://skepticalscience.com
http://julesandjames.blogspot.com
http://rabett.blogspot.com
http://climateprogress.org
http://initforthegold.blogspot.com
http://desmogblog.com
http://deepclimate.org
http://moregrumbinescience.blogspot.com
http://dotearth.blogs.nytimes.com
http://simondonner.blogspot.com
http://aip.org
http://blogs.nature.com

Source Set 3. Climate change science network - ranked actor list by page (top 15 actors excluding addthis.com and twitter.com)

http://noaa.gov
http://ipcc.ch
http://nsf.gov
http://earth.columbia.edu
http://nws.noaa.gov
http://realclimate.org
http://giss.nasa.gov
http://essp.org
http://skepticalscience.com
http://weather.gov
http://ucar.edu
http://grants.gov
http://unep.org
http://diversitas-international.org
http://wmo.ch