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):
@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.
@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 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...
@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...
@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
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.
@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...
@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:
🧵Thread with a few zingers from this January’s report on climate risk by the Actuaries…
[h/t @James7jackson and @AndrewsonEarth]
“Commonly used ‘net zero’ budgets only give a 50/50 chance of limiting warming to well below 2°C. Put another way, the chance of them failing to limit warming is as high as the chance of them limiting warming.”
“Damages already outweigh the mitigation costs required to limit global warming to 2°C, i.e., it will be overwhelmingly positive economically to limit global warming”
Gulp… “The rate of natural sequestration of CO2from the atmosphere by the terrestrial biosphere peaked in 2008. Atmospheric concentrations will rise more rapidly than previously, in proportion to annual CO2emissions, as natural sequestration is now declining by 0.25% per year.”
“This analysis confirms that the rate of natural sequestration of CO2 from the atmosphere by the terrestrial biosphere is now declining, having reached a peak in 2008”… “This effect will accelerate climate change”
If this is true, it would mark a catastrophic future given current rates of anthropogenic CO2 and CH4 emissions. There is, however, another view about the trend in the land sink in recent years:
Each year, Arctic Sea Ice Extent reaches a low point in September. But over the last 15 years or so, the September minimum extent *appears* to have plateaued...
🧵Thread on this why this is happening, and how it's hiding catastrophic changes...
2) To be clear, the Arctic Sea Ice Extent is still declining. At this very moment it is at record low levels (which is deeply alarming given that it's currently experiencing a La Niña Winter)... but the RATE of Sea Ice Extent decline *is* indeed slowing down.
3) The reason why the rate of change is slowing is because the ice is getting thinner. NASA explains: The Arctic Ocean has "already lost most of its old ice and two-thirds of its thickness. [So] The younger ice is thinning more slowly and variably."
🧵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.”
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.
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)…
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
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.
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"