GEOPHYSICAL RESEARCH LETTERS, doi:10.1029/2012GL054271 Global warming in an independent record of the last 130 years http://www.agu.org/pubs/crossref/pip/2012GL054271.shtml Key Points Global warming is observed in an independent record of the past 130 years Vets upward trend in thermometer record including two periods of upward trend Paleo data with physical links to temperature can be used without calibration Abstract: ...From 1880 to 1995, the index trends significantly upward, similar to the GST. Smaller-scale aspects of the GST including two warming trends and a warm interval during the 1940s are also observed in the paleo index. The paleo index continuously extends back to 1730 with 66 records. The upward trend appears to begin in the early 19th century but the year-to-year variability is large and the 1730-1929 trend is not significant at the p<0.05 level... [/quote] Mostly a proxy study but as they use an index comprised of "170 temperature-sensitive proxy time series (corals, ice cores, speleothems, lake and ocean sediments, historical documents)," and correlates tightly with calibrated instrument records where there is overlap, this seems fairly rigorous. Of course their methodology and data will have to be fully vetted in field peer-review now that the paper has cleared editorial publication peer-review and has been published in GEOPHYSICAL RESEARCH LETTERS.