Explore declining carbon capture by plants with world recognized expert Dr. Pep Canadell, Chief Research Scientist CISRO Australia & Exec. Dir. of the Global Carbon Project
2017 podcast talk by David Wasdell
David Wasdell Arctic amplification 2014talk part 1
David Wasdell's lecture on runaway positive feedbacks of abrupt global warming - 2007
https://www.apollo-gaia.org/ArcticDynamics.html
his website
David Wasdell vimeo lecture on the Arctic 2014
We were told that Wasdell (and Peter Wadhams) were wrong but they were just off by ten years out of 3 million years!! (what's the error rate on that?).
Despite the noise, the best-fit line on this chart of real data looks inexorable and suggests that Septembers with no Arctic sea ice could first appear from 2030
https://www.arcticdeathspiral.org/
https://www.nasa.gov/earth/arctic-winter-sea-ice-at-record-low/
Winter sea ice cover in the Arctic was the lowest it’s ever been at its annual peak on March 22, 2025, according to NASA and the National Snow and Ice Data Center (NSIDC) at the University of Colorado, Boulder. At 5.53 million square miles (14.33 million square kilometers), the maximum extent fell below the prior low of 5.56 million square miles (14.41 million square kilometers) in 2017.
NASA vid on the lowest Arctic ice
https://nsidc.org/sea-ice-today/analyses/arctic-sea-ice-sets-record-low-maximum-2025
The September ice volume is plummeting towards zero - it's dropped by nearly 80% in 40 years, so at this rate there will be no summer ice by 2029.
https://www.apollo-gaia.org/Harsh%20Realities.pdf
David Wasdell's feedback report
https://nebulousresearch.org/other/climate/ice
https://www.ecoshock.org/audio-on-demand/2025-radio-ecoshock-show
So David Wasdell is emphasizing that "slow feedbacks" are the full "earth sensitivity" so that "doubling CO2-emissions" is probably 8 degrees C. global average increase.
We're already doomed to a 6 degree Celsius increase unless we do something about it....
In order to maintain the energy balance of the Earth, the average surface temperature of the
planet has to change by 1°C to compensate for each 3.8 watts per square metre of radiant energy blocked by change in the greenhouse effect. So if temperature has changed by 5°C between the depth of the last ice-age and the pre-industrial benchmark, it means that 19 (3.8 x 5) watts per square metre has been blocked because of the change in the greenhouse effect and the reflectivity of the planet during that period.
Completing the amplifying effect of all the feedback processes of the whole earth system
provides a value of 8.0 for the Amplification Factor. In other words the Earth System as a
whole amplifies the contribution from change in the atmospheric concentration of CO2
by a factor of 8.0, a little over 2.5 times the value used by the IPCC in its strategic advice to
Policymakers.
Just examine the way the earth system behaves at the level of 700 ppm. We are not looking at something around 4°C on the blue line, but an increase of more like 10°C on the red line. That is twice the temperature shift between the ice ages and the pre-industrial benchmark. If we are not able to constrain the current “business as usual” behaviour, then the temperature rise increases to more like 12°C, (and two or three times that amount in the Arctic!) Good bye all the ice on earth. Welcome to something like 90 feet of sea level rise, or even more when all the Greenland ice-cap and the whole of the Antarctic ice sheet melts. Civilisation would have collapsed and we would have evacuated London well before then!
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