Guy McPherson (1960)
McPherson in 2014 (Wikipedia)
Website: Nature Bats Last (guymcpherson.com)
Video by Motion Media (part 1: presentation in York, UK), 5 mei 2015, 23m18
Video by Motion Media (part 2: discussion after presentation in York, UK), 5 mei 2015, 40m22
Video by NewsHub, New Zealand, 25 nov 2016, 10m10
Human Extinction Within 10 Years
Video by Nature Bats Last, 9 sep 2019, 1m55 (Click on video header for the rest of it)
Guy McPherson: “Gavin Schmidt lies by omission about the aerosol masking effect [‘global dimming’]. These [Kate Marvel and Gavin Schmidt] are not reliable people”
Literatuur waar Guy McPherson naar verwijst
In video 8 juli 2020:
C. Raymond et.al., The emergence of heat and humidity too severe for human tolerance,
Science Advances Vol. 6, no. 19, 08 May 2020
Humans’ ability to efficiently shed heat has enabled us to range over every continent, but a wet-bulb temperature (TW) of 35°C marks our upper physiological limit, and much lower values have serious health and productivity impacts. Climate models project the first 35°C TW occurrences by the mid-21st century. However, a comprehensive evaluation of weather station data shows that some coastal subtropical locations have already reported a TW of 35°C and that extreme humid heat overall has more than doubled in frequency since 1979. Recent exceedances of 35°C in global maximum sea surface temperature provide further support for the validity of these dangerously high TW values. We find the most extreme humid heat is highly localized in both space and time and is correspondingly substantially underestimated in reanalysis products. Our findings thus underscore the serious challenge posed by humid heat that is more intense than previously reported and increasingly severe.
Figure 1 (click to enlarge)
Color symbols represent the 99.9th percentile of observed daily maximum TW for 1979–2017 for HadISD stations with at least 50% data availability over this period. Marker size is inversely proportional to station density.
Steep and statistically significant upward trends in extreme TW frequency (exceedances of 27°, 29°, 31°, and 33°C) and magnitude are present across weather stations globally
(A to D) Annual global counts of TW exceedances above the thresholds labeled on the respective panel, from HadISD (black, right axes, with units of station days) and ERA-Interim grid points (gray, left axes, with units of grid-point days). We consider only HadISD stations with at least 50% data availability over 1979–2017.
Correlations between the series are annotated in the top left of each panel, and dotted lines highlight linear trends. (E) Annual global maximum TW in ERA-Interim. (F). The line plot shows global mean annual temperature anomalies (relative to 1850–1879) according to HadCRUT4, which we use to approximate each year’s observed warming since preindustrial; circles indicate HadISD station occurrences of TW exceeding 35°C, with radius linearly proportional to global annual count, measured in station days.