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This is for my personal use, but feel free to use it as you wish. --Chriswaterguy 17:34, 27 August 2013 (PDT)
These search engines cover a number of websites of skepticism, rational thinking and/or thinking tools.
First, my attempt of 28 Aug 2013 - not exhaustive, just a few sites I find useful:
"searches sites including: all-embracing.episto.org, savvyskeptic.com, skeptical.gb.net, skepticfamily.com, queryonline.it"
Greg Laden's Skeptical Search Engine
This looks good for climate questions: