Let's knock a couple more home runs. Shall we?
Claim 33. The rate of retreat of glaciers has stayed about the same since around 1850.... There hasn't been an acceleration in glacier retreat worldwide...Glacier retreat does not always correspond with a warming temperature.
Response: There has been an acceleration in the loss of global glacier volume....
Let's see. "Rate of retreat" is a one dimensional measure, units of distance per time unit. The response concerns "acceleration", which is not "rate", and "volume", which is not "distance".
Well, these guys just can't keep the subject matter straight, or they don't understand basic units. The claims not inconsistent. Hence, the claim by Harris is not rebutted by the response.
Claim 34. It may be more than a coincidence that the 18th century, which was getting slightly warmer...than previously, they saw a more cheerful social and political mood.
RESPONSE: See table 19 in [28] for a list of projected impacts associated with climate change.
Apparently apples to oranges is popular. "Projected impacts" has nothing to due with a note as to what was going on in the 19th century.
Claim 37. ‚And just based on this one paper [referring to the Mann et al. "hockey stick graph"], and their research, the UN did a complete u-turn... they had decades of reports and scientific papers that showed there was a little ice age, there was a medieval warm period, they could see it in the historical climatology, they could see it in the paintings that were done at that time, things like height of people, all sorts of evidence. But this particular graph threw that all away. And this was considered the smoking gun of human impact on climate.?
RESPONSE: Michael Mann and colleagues published the hockey stick paper in 1998 [55], which aggregated Northern Hemisphere historical temperature reconstructions. This presentation revealed a distinct uptick in global temperatures, in multiple data sets, in the second half of the 20th Century. Rather than a u-turn, the graph further supported mainstream climate science opinion that recent temperature increases were unusual. In other words, Mann et al. focused on climate change detection, not attribution as Harris suggests....
Harris does not state or imply that Mann attributed the hockey stick to human causation, but simply that it has came to be considered such.
Harris notes the "UN did a complete u-turn", in this he refers to the UN's previous resentations of historical climate, where they published charts that did show the little ice age and the medievel warm period. The authors of the "Report" deliberately misdirect and reframe the "CLAIM" so as to assert Harris is wrong, but .... Harris is correct.
However, and more interestingly, the "Report" authors are wrong on the basic science. Mann 1998 certainly did ascribe the hockey stick to man's activities in producing greenhouse gases.
We take an empirical approach to detecting the possible effects of external forcings on the climate. The reconstructed NH series is taken as a diagnostic of the global climate, and we examine its relationship with three candidate external forcings during the period 1610–1995 including (1) CO2 measurements39 as a proxy for total greenhouse-gas changes, (2) reconstructed solar irradiance variations2 and (3) the weighted historical ‘dust veil index’ (DVI) of explosive volcanism (see Fig. 31.1 in ref. 40) updated with recent data41. While we warn that historical series for these forcing agents are imperfectly known or measured, they do nonetheless represent our best estimates of the time-histories of the corresponding forcings.