Claim: it later emerged that its creator Dr Michael Mann had spliced too [sic] datasets together – tree-rings showing temperatures going back hundreds of years, then recent thermometer readings for the more recent decades.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Mann said, "Ten years ago, the availability of data became quite sparse by the time you got back to 1,000 AD, and what we had then was weighted towards tree-ring data; but now you can go back 1,300 years without using tree-ring data at all and still get a verifiable conclusion."

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Using various high-resolution proxies including tree rings, ice cores and sediments, Mann and Jones published reconstructions in August 2003 which indicated that "late 20th century warmth is unprecedented for at least roughly the past two millennia for the Northern Hemisphere.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: For his postdoctoral research, Mann joined Bradley and tree ring specialist Malcolm K. Hughes to develop a new statistical approach to reconstruct underlying spatial patterns of temperature variation combining diverse datasets of proxy information covering different periods across the globe, including a rich resource of tree ring networks for some areas and sparser proxies such as lake sediments, ice cores and corals, as well as some historical records.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: "Mike's Nature trick" referred to Michael E. Mann's paper on temperature trends published by Michael Mann in Nature in 1998, which combined various proxy records and related them to actual temperature records: it included a figure later dubbed the ""hockey stick" graph, which clearly distinguished between the proxy and instrumental data.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: By combining multiple tree-ring studies (sometimes with other climate proxy records), scientists have estimated past regional and global climates (see Temperature record of the past 1000 years).

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: The deviation of some tree ring proxy measurements from the instrumental record since the 1950s raises the question of the reliability of tree ring proxies in the period before the instrumental temperature record.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: The longer history of the proxy is then used to reconstruct temperature from earlier periods.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: The longer history of the proxy is then used to reconstruct temperature from earlier periods.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Gore's use of long ice core records of CO2 and temperature (from oxygen isotope measurements) in Antarctic ice cores to illustrate the correlation between the two drew some scrutiny; Schmidt, Steig and Michael E. Mann back up Gore's data.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: published on 10 February 2005 used a wavelet transform technique to reconstruct Northern Hemisphere temperatures over the last 2,000 years, combining low-resolution proxy data such as lake and ocean sediments for century-scale or longer changes, with tree ring proxies only used for annual to decadal resolution.