<p>Stick to the facts: In a regional chapter on Asia in Working Group 2 (climate impacts) of the 4th IPCC report, written by authors from the region, it was erroneously stated that 80% of Himalayan glacier area would very likely be gone by 2035. This was of course not the proper IPCC projection of future glacier decline, which is found in the Working Group 1 report (which is the one about basic climate science, including the future projections of climate change). There we find a 45-page, perfectly valid chapter on glaciers, snow and ice (Chapter 4), with the authors including leading glacier experts (such as my good colleague Georg Kaser from Austria, who first discovered the Himalaya error in the WG2 report). There are also several pages on future glacier decline in Chapter 10 (“Global Climate Projections”), where the proper projections are used e.g. to estimate future sea level rise. So the problem here is not that the IPCC’s glacier experts made an incorrect prediction. The problem is that a WG2 chapter, instead of relying on the proper IPCC projections from their WG1 colleagues, cited an unreliable outside source in one place. Fixing this error involves deleting two sentences on page 493 of the WG2 report. This was an unfortunate citation error by the WG2 colleagues from Asia, but it was not based on an incorrect prediction by the IPCC climate scientists, as you well know.</p>

<p>Stick to the facts: the IPCC does in fact give as its best estimate all of the warming since 1950 is caused by humans. The natural contributions are estimated to be about zero and constrained to be within -0.1 and +0.1 °C for both internal and externally forced natural variability. That is why the IPCC writes in the Summary for Policy Makers (available at www.ipcc.ch): "It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century."
I wonder why you keep downplaying the serious risk that global warming poses to human civilisation, even to the extent of distorting to your readers what the IPCC (i.e. the scientific community at large) finds.</p>

<p>Stick to the facts: the IPCC writes about sea level in its Summary for Policy Makers (available at www.ipcc.ch):
"For RCP8.5, the rise by the year 2100 is 0.52 to 0.98 m".
(RCP8.5 is a scenario with unmitigated rise in greenhouse gas emissions.)
For the lowest emissions scenario RCP2.6 (which involves drastic emissions reductions starting in a few years and leading to zero global emissions by 2070, after that active removal of CO2 from the atmosphere) the best estimate sea-level rise by the year 2100 given by IPCC is 44 cm. </p>