confidence attribution, otherwise this is providing misinformation.
739    P1091/L18 The analogy to steroids in not appropriate. If one reads the IPCC SREX response to the FAQ (is becoming more extreme, p.124) next to this paragraph, one is left with the impression that this draft is hype.
740    P1092 reference for the caption conclusions should be provided and validity assessed through traceable account (this is not commonly covered in assessments).
741    P1093/L24 “availability of calcium carbonate” does not make sense? Perhaps concentration of carbonate ion is what is meant?
742    P1095/L7 “supersaturated with calcium carbonate minerals” does not make sense.
743    P1095/L8 “concentration of these minerals” does not make sense.
744    P1095/L11 30% — shouldn’t this now be higher since CO2 has increased 40%?
745    P1095/L15 Should also mention that there are large variations in pH in ocean sediments. The 20 million only refers to inferred average ocean surface pH.
746    P1095/L23 The shell shown seems to not include the actual pteropod (only the shell). Is this all the evidence that we have (it is not convincing or particularly relevant since shells have always been dissolving on some parts of the sea floor)?
747    P1096/L1 This text does not answer the question of trust and the NCA largely does not discuss uncertainty of projections. Clearly we would not trust the models in the same way we trust those that, for example, control airplanes.
748    P1096/L14 “do a good job”? No proof provided. Projections of precipitation differ in sign between some models which is hard to describe as “good job.”
749    P1099 Should show estimates of uncertainties in projections.
750    P1100 This section seems to go further than the executive summary says we know about tipping points. It should be explained that there is not a consensus among models about major tipping points occurring this century.
751    P1108 Variability or vulnerability? This chart needs discussion if included.
752    P1109/L11 Biofuels? The land use and life cycle emissions of corn ethanol mean it cannot contribute significantly.
753    P1109 This page only describes end use and not power generation which has large scope for reducing emissions.


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