Thank you LDM and Dan,
@LDM:
(IMO) Thanks for sharing! IMO this recent Hansen and Kharecha
Newsletter with further evidence supporting a climate sensitivity
of 4.5 rather than the established IPCC value of 3.0 that is (as
I understand it) embedded in most current climate models, is
excellent and should be widely distributed, per these last two
paragraphs:
"Criticisms of the Acceleration paper in the media did not
address the physics in our three assessments of
climate sensitivity. Instead, criticisms were largely ad hoc
opinions, even ad hominem attacks. How can
science reporting have descended to this level? Climate science
is now so complex, with many sub-
disciplines, that the media must rely on opinions of climate
experts. Although there are thousands of
capable scientists in these disciplines, the media have come to
depend on a handful of scientists, a clique
of climate scientists who are willing, or even eager, to be the
voice of the climate science community.
But are they representative of the total community, of capable
scientists who focus on climate science?
We have lamented9 the absence of scientists with the breadth of
understanding of say Jule Charney or
Francis Bretherton,10 or our beloved, sometimes crotchety, former
colleague, Wally Broecker. However,
the truth is that there are many scientists out there with a
depth of understanding at least as great as the
clique of scientists that the media rely on. Given the success of
this clique in painting us as outliers, we
are dependent on the larger community being willing to help
educate the media about the current climate
situation. For that purpose, we will discuss – one-by-one in
upcoming communications – several of the
matters that are raised in our papers. Thanks for your attention."
@Dan: Thanks for sharing! I will definitely give this a listen!
Best,
Ron
On Sun, May 18, 2025 at 4:04 PM LDM <[email protected]> wrote:
https://www.columbia.edu/~jeh1/mailings/2025/CloudFeedback.13May2025.pdf
Large Cloud Feedback Confirms High Climate Sensitivity
James Hansen and Pushker Kharecha
13 May 2025
Abstract.
Earth’s albedo (reflectivity) declined over the 25 years of
precise satellite data, with the decline so large that this
change must be mainly reduced reflection of sunlight by
clouds. Part of the cloud change is caused by reduction of
human-made atmospheric aerosols, which act as condensation
nuclei for cloud formation, but most of the cloud change is
cloud feedback that occurs with global warming. The observed
albedo change proves that clouds provide a large, amplifying,
climate feedback. This large cloud feedback confirms high
climate sensitivity, consistent with paleoclimate data and
with the rate of global warming in the past century.
https://youtu.be/NxV1IbHt7fU
When Will We Go Over 2ºC? & Hansen's Cloud Update
<https://www.youtube.com/@climatechat>
On Sun, May 18, 2025 at 9:09 PM Ron Baiman
<[email protected]> wrote:
Wow! Thanks for sharing Renaud. I haven't read it but
from the abstract it (very unfortunate for all of us
humans and most other species, but not really surprising
for many of us humans) looks like forecasts of Hansen et
al. 2024 are being vindicated!
Best,
Ron
On Wed, May 14, 2025 at 9:51 AM Renaud de RICHTER
<[email protected]> wrote:
Earth's Energy Imbalance More Than Doubled in Recent
Decades
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024AV001636
Abstract
Global warming results from anthropogenic greenhouse
gas emissions which upset the delicate balance
between the incoming sunlight, and the reflected and
emitted radiation from Earth. The imbalance leads to
energy accumulation in the atmosphere, oceans and
land, and melting of the cryosphere, resulting in
increasing temperatures, rising sea levels, and more
extreme weather around the globe. Despite the
fundamental role of the energy imbalance in
regulating the climate system, as known to humanity
for more than two centuries, our capacity to observe
it is rapidly deteriorating as satellites are being
decommissioned.
Key Points
*
Earth's energy imbalance more than doubled in
recent decades
*
The large trend has taken us by surprise, and as
a community we should strive to understand the
underlying causes
*
Our capability to observe the Earth's energy
imbalance and budget terms is threatened as
satellites are decommissioned
Plain Language Summary
Global warming is caused by the imbalance between the
incoming radiation from the Sun and the reflected and
outgoing infrared radiation from the Earth. The
imbalance leads to energy accumulation in the
atmosphere, oceans and land, and melting of the
cryosphere, resulting in increasing temperatures,
rising sea levels, and more extreme weather around
the globe according the the United Nations
Intergovernmental Panel on Climate Change (IPCC).
Observations from space of the energy imbalance shows
that it is rising much faster than expected, and in
2023 it reached values two times higher than the best
estimate from IPCC. We argue that we must strive to
better understand this fundamental change in Earth's
climate state, and ensure our capacity to monitor it
in the future.
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Addressing the Urgent Need for Direct Climate Cooling: Rationale
and Options
<https://academic.oup.com/oocc/article/4/1/kgae014/7731760>
Baiman et al. 2024. /Oxford Open Climate Change/
An Open Letter to the IMO Supporting Maritime Transport that
Cools the Atmosphere While Preserving Air Quality Benefits
<https://academic.oup.com/oocc/article/4/1/kgae008/7706251>.
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