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I put a version of Nadja's blog post on "the deterioration of climate data" on the wiki:
I edited her English, added links, and added a short section of links to discussions of the effects of missing data on HadCRUT4. Everyone - especially Nad - should take a look and see if they like this post.
Note: this version has been superseded and will not be posted to the blog. For a discussion of the new version, go here.