Alexander Eli Pope
Moved from the comments at Stoat
"Great fleas have little fleas
upon their backs to bite 'em,
And little fleas have lesser fleas,
and so ad infinitum.
Yet data set fleas are larger still
Than the great disks which hold em
And no one knows where a misprint lurks
Until they stumbles upon one"
-ER with apologies Augustus de Morgan
As is being pointed out by Gavin at Real Climate, the only way of fighting this law of nature is to depend on multiple sources and critically evaluate each. It basically is the rock on which the McIntrye and McKitrick attack on multiproxy paleoclimate evaluations and Roger P Sr's take a picture of a weather station foundered (Roger set it off, by the way he is back for another bite at the apple)
Here is the beginning of my post. And here is the rest of it.