This document discusses the problem of separating natural and anthropogenic climate forcing as well as uncertainties in proxy climate data.
Uncertainty of causes and climate variability during past centuries: Regional and climate mode response
Caspar Ammann
University Corporation for Atmospheric Research
archival document
Uncertainty
Weather and Climate Impact Assessment Science Program Records
https://aspace.archives.ucar.edu/repositories/2/resources/67
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http://n2t.net/ark:/85065/d72z14w3