Ryan Katz-Rosene, PhD Profile picture
Aug 19, 2019 24 tweets 40 min read Read on X
Holy f!&$%# talking on national radio is nerve-wracking...

(especially when your fellow radio guests are climate gurus @KHayhoe and @KenCaldeira!)

Blanked a few times there, but fun discussion nonetheless.

There’s so much more to say about this, so thread coming soon...
@KHayhoe @KenCaldeira OK, in the same vain as my previous thread “Should I cut out meat and dairy for the climate?” (bit.ly/2TJQh2l), it seems like the time is now right for a NEW THREAD:

“Should I stop flying for the climate?”

Here're my 2 cents... BUCKLE UP!
@KHayhoe @KenCaldeira 1/ First, let’s acknowledge (own?) some ‘problems’ with #FlyingLess. As @drvox implies in this long thread, an individual's decision to fly will add an INFINITESSIMALLY SMALL amount of CO2 to the atmosphere (akin to adding a pebble of sand to a beach):

bit.ly/33M5PqK
@KHayhoe @KenCaldeira @drvox 2/ In other words... WE WILL NOT SOLVE THE CLIMATE MITIGATION PUZZLE through individual action. We ultimately need COLLECTIVE-SCALE changes (to business-as-usual capitalism): regulating corporations; pricing incentives; smart investments; good policy!
bit.ly/2PjDLrZ
@KHayhoe @KenCaldeira @drvox 3/ As @MichaelEMann points out in the above article, there’s also a DANGER in placing the onus for change on consumers (instead of CORPORATIONS, decision-makers, etc.)... that's a potential outcome when people become FIXATED on their carbon 'lifestyles'.
@KHayhoe @KenCaldeira @drvox @MichaelEMann 4/ Another problem: Only a small % of the population are responsible for the bulk of aviation emissions. Most people don’t fly, or just once/year. So there’s a danger in coming across as “preachy” to EVERYONE, when in fact it’s (usually) the WEALTHIEST few who are the problem. Image
@KHayhoe @KenCaldeira @drvox @MichaelEMann 5/ Aviation offers tremendous benefits and opportunities which a majority of world hasn't experienced. As @arvindpawan1 has pointed out, there’s a risk that #FlyingLess takes on an IMPERIALIST tone (if it fails to differentiate WHO it’s asking to change).
bit.ly/2MpQtmF
@KHayhoe @KenCaldeira @drvox @MichaelEMann @arvindpawan1 6/ And another challenge (in some geographical contexts): There are sometimes NO VIABLE low-carbon alternatives to flying. This is a REAL PROBLEM in Canada, where LONG-DISTANCE train travel is often WORSE than flying on a per-passenger basis!
@KHayhoe @KenCaldeira @drvox @MichaelEMann @arvindpawan1 7/ So.. #FlyingLess needs to tread carefully in its messaging. The research shows that if people feel ‘attacked’ or their identities called into question, it can result in a “boomerang effect” wherein they just return to their original behaviour.
bit.ly/2MoR6Ni
@KHayhoe @KenCaldeira @drvox @MichaelEMann @arvindpawan1 8/ OK, so does this mean there’s NO VALUE in #FlyingLess?
@KHayhoe @KenCaldeira @drvox @MichaelEMann @arvindpawan1 9/ Before we get to THE VALUE OF FLYING LESS, let’s talk about WHY aviation specifically is a PROBLEM. As @Peters_Glen has pointed out, at a global level aviation is only really a sliver of the CO2 pie...

bit.ly/31PgtLS
@KHayhoe @KenCaldeira @drvox @MichaelEMann @arvindpawan1 @Peters_Glen 10/ BUT... CO2 is only PART of the problem. The world-leading authorities on aviation & climate (David Lee et al.) noted that in 2005 aviation was responsible for 4.9% of RADIATIVE FORCING. It’s 15 years later now, and that’s gonna be higher I’m sure...

bit.ly/2zaSxWM
@KHayhoe @KenCaldeira @drvox @MichaelEMann @arvindpawan1 @Peters_Glen 11/ 4.9% may not SOUND like a lot, but consider that only 6% of the world flies each year. That makes aviation an activity with an OUTSIZED impact (compared to, say, meat consumption - in which 95% of the world participates – at 14.5% of global GHGs).
bit.ly/2HdM6a0
@KHayhoe @KenCaldeira @drvox @MichaelEMann @arvindpawan1 @Peters_Glen [that’s another qualm I have w meat comparison; we only ever discuss climate footprint of FLIGHTS. That 14.5% is for the ENTIRE LIVESTOCK SUPPLY CHAIN, including deforestation].

I wonder... what’s the carbon footprint of the ENTIRE AVIATION SUPPLY CHAIN?
@KHayhoe @KenCaldeira @drvox @MichaelEMann @arvindpawan1 @Peters_Glen OK, but isn’t TECHNOLOGY reducing aviation emissions? To an extent, yes. Biofuels (especially new gen. which don’t impact food supply); low-weight materials; baggage surcharges; improved air traffic ALL help. BUT these efficiency gains are being outstripped by DEMAND GROWTH. Image
@KHayhoe @KenCaldeira @drvox @MichaelEMann @arvindpawan1 @Peters_Glen 14/ Right... but what about global governance? Doesn’t the UN’s Carbon Offsetting and Reduction Scheme for Aviation (CORSIA) plan to achieve “carbon-neutral growth from 2020”? Yeah, about that...

carbonbrief.org/aviation-consu…
@KHayhoe @KenCaldeira @drvox @MichaelEMann @arvindpawan1 @Peters_Glen 15/ So... Despite its many benefits, aviation is PRESENTLY a real challenge for climate change mitigation – this may change in a few decades w electric ✈️, but as the IPCC has pointed out, we need to start rapid DECARBONIZATION NOW: Image
@KHayhoe @KenCaldeira @drvox @MichaelEMann @arvindpawan1 @Peters_Glen 16/ And so we arrive at #FlyingLess. I can think of a number of reasons why – despite all the caveats – one may want to take part! First, as @bsaxifrage has shown, flying IS often one of the largest contributions, so cutting back can make a significant PERSONAL impact: Image
@KHayhoe @KenCaldeira @drvox @MichaelEMann @arvindpawan1 @Peters_Glen @bsaxifrage 17/ Second, as @GretaThunberg has said, this is about demonstrating the URGENCY of climate change at the political level. It’s a form of protest. It’s NOT about signalling ‘virtue’ or telling people what to do, but rather signalling POLITICAL PRIORITIES.
bit.ly/2Zaz9UE
@KHayhoe @KenCaldeira @drvox @MichaelEMann @arvindpawan1 @Peters_Glen @bsaxifrage @GretaThunberg 18/ Third: As @DoctorVive points out in this MAGNIFICENT THREAD (and this is especially the case for those of us in the climate community), flying less “increases our public credibility and inoculates us against the charge of moral hypocrisy”. Well said!

bit.ly/2z5KlXU
@KHayhoe @KenCaldeira @drvox @MichaelEMann @arvindpawan1 @Peters_Glen @bsaxifrage @GretaThunberg @DoctorVive 19/ Fourth, by talking about the benefits of #FlyingLess, or the fruitful experiences had whilst taking other transport modes or digital conferencing, we are DEMONSTRATING that low-carbon life is not so bad after all, not the sacrifice some believe it to be!
@KHayhoe @KenCaldeira @drvox @MichaelEMann @arvindpawan1 @Peters_Glen @bsaxifrage @GretaThunberg @DoctorVive 20/ IF done right (and that’s a big ‘IF’) – #FlyingLess can be INCLUSIVE, SUPPORTIVE, COLLABORATIVE, and CONTAGIOUS!

Must read on this (h/t @seleross): maisonneuve.org/article/2019/0…
@KHayhoe @KenCaldeira @drvox @MichaelEMann @arvindpawan1 @Peters_Glen @bsaxifrage @GretaThunberg @DoctorVive @seleross 21/ So, bottom line: Is there value in #FlyingLess? Yes there is.
✈️Travel responsibly
✈️If you must fly, make it count!
✈️Join the movement! (See @flyingless ; @ClimateHuman; For academics: tiny.cc/e6gm9y)
✈️Channel your action to the COLLECTIVE scale.
@KHayhoe @KenCaldeira @drvox @MichaelEMann @arvindpawan1 @Peters_Glen @bsaxifrage @GretaThunberg @DoctorVive @seleross @flyingless @ClimateHuman 22/ As for the latter... Write an MP; join a campaign; run for office; sign a petition, protest, donate, join with others, etc.

(Here’re ideas for regulatory changes to reduce aviation GHGs):
bit.ly/2MenrDm

/fin

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More from @ryankatzrosene

Dec 20, 2024
🧵More evidence that albedo changes are behind the “extra unexplained 0.2°C” of warming:

“I’m confident it’s a missing piece. It’s the missing piece,” says Tselioudis, who presented the work last week at a meeting of the American Geophysical Union.”Image
2/ Building off his team’s work from earlier this year👇, Tselioudis and co. have found that cloud coverage has fallen by about 1.5% per decade for the last 35 years. Image
3/ The findings are somewhat similar to work by Loeb et al., and Goessling et al., both published this year, with some key differences (one being the specific satellite data sets they are using)… Image
Image
Read 4 tweets
Dec 6, 2024
This is a new important paper. It's not good news. It also corroborates much of what @LeonSimons8 has been raising the alarm about over the last couple years about changes to Earth's Energy Imbalance (though this paper focuses on 2023 specifically).

QUICK THREAD Image
2) Essentially the paper tried to explain the "missing 0.2C" that global climate models appeared to miss out on in 2023 after factoring in all we know about GHGs, El Niño, the peak of the Solar Cycle, Hunga Tonga, and even the Shipping Aerosols changes from IMO 2020. Image
3) They used NASA satellite data and ERA5 reanalysis for last year and found that Earth had a record low level of albedo. Yikes. This, in turn, was due to "a pronounced decline of low-level clouds over the northern mid-latitude and tropical oceans, in particular the Atlantic"Image
Read 6 tweets
Dec 2, 2024
🧵Thread with examples of why it’s dumb to say “CO2 is only 0.04% of the atmosphere, so it can’t possibly have an effect!”

It’s time to just ignore the “400ppm is too small to have an impact” meme… Image
Image
Caffeine Image
Dye Image
Read 12 tweets
Nov 22, 2024
🧵I've posted a lot of scary papers about AMOC collapse recently. And I've corresponded with some leading scientists. It is scary, no doubt about it.

This thread shows there are some scientists who are not yet convinced, or are at least skeptical that AMOC is on a death-spiral.
2) Latif et al. 2022 argue that changes in the AMOC may be primarily driven by natural fluctuations rather than being solely or predominantly a consequence of human-induced climate change.

Further, they write "A relatively stable AMOC and associated northward heat transport during the past decades is also supported by ocean syntheses combining ocean general circulation models and data, hindcasts with ocean general circulation models forced by observed atmospheric boundary conditions, and instrumental measurements of key AMOC components. Neither of these datasets suggest major AMOC slowing since 1980, and neither of the AMOC indices from Rahmstorf et al. or Caesar et al. show an overall AMOC decline since 1980."Image
3) He and Clark 2022 challenge the prevailing wisdom about the role of freshwater influx in significantly weakening the AMOC. They don't altogether refute the role of a collapse of AMOC in abruptly changing the climate in the past or even possibly in the future. However, they do suggest that "projections of AMOC decline in the twenty-first century ... may be overestimated".Image
Read 8 tweets
Nov 14, 2024
It's time for another AMOC Collapse thread!

This includes some clarifications on the TIMING of a potential tipping vs. collapse and their *impacts*, based on a conversation I've had with a co-author of the recent pre-print "Probability Estimates of a 21st Century AMOC Collapse"Image
2/ First, there's been a lot of confusion in the media and especially here on social media about what the pre-print meant by "The collapse time is estimated between 2037-2064... with a mean of 2050". The AMOC current is bi-modal, so generally it's ON or OFF, and once it passes a tipping point, MODELS suggest that there's a roughly 100-year freefall period towards collapse. Many were unclear (and I admit, I was not fully clear myself, and I apologize) on whether this implied that the *tipping point* has already occurred roughly 70 years ago and therefore that the current itself would be 'OFF' by 2050, or whether the *tipping point* was likely to be reached around 2050, meaning the full shutting off of the current would till be over a Century from now, closer to 2150.

I have now confirmed that it is THE LATTER. That is, to the extent that this MODEL reflects what happens in reality (which is indeed unlikely since it is indeed just a model), the *model year* 1758 in van Westen et al. 2024 roughly corresponds to the 'mean AMOC collapse time' of 2050 in the Smolders et al. 2024 pre-print.Image
2/ Here we can see the historical changes in flow of the AMOC based on 5 reanalysis products. These suggest that a tipping point has NOT yet been reached. The main point of all this work is to point out that the models all seem to suggest a weakening of the AMOC, and that should be deeply alarming because it could reach a tipping point, after which a 'course correction' is *extremely difficult* if not impossible.Image
Read 7 tweets
Nov 4, 2024
1/ I’ve been wondering a bunch of things about a potential AMOC collapse: "When will it tip?" "What are the most likely effects?" "Can we stop it?" So I looked for answers in the many scientific papers published on this. Here’s a super plain language thread with what I found.🧵Image
2/ WTF is the AMOC? It’s the ‘Atlantic Meridional Overturning Circulation’, which is a fancy name for an important ocean current that effectively serves as a ‘heat pump’ for Earth - bringing warm surface water from the tropics Northward, releasing its heat, sinking, then bringing deeper cold water back South.Figure from Rahmstorf 2024
3/ How much is the AMOC weakening? Numerous studies show that the AMOC is indeed weakening substantially, more than even the latest climate models expected, and that it’s at its weakest state in the last 1600 years. Figure from Rahmstorf 2024
Read 10 tweets

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