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:
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.🧵
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.
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.
🧵Here's a little story about a scientific paper from 20 years ago that sought to cast doubt on @MichaelEMann's famous 'Hockey Stick' warming graph by reworking his original data set. Now, 20 years out *even this same revised dataset* now very clearly shows.... a Hockey Stick!
2) In 1998 Mann and colleagues published a very important paper in Nature. They conducted an impressive study compiling temperature reconstructions for the last 6 Centuries, and found a startling 'hockey stick' shape: The world was warmer than it had been in nearly 600+ years!
3) Some years later, two Canadians wrote a paper refuting these findings, thus casting doubt on the modern human influence in global warming🤦♂️. They asked Mann for the original data (which he kindly supplied), and then claimed that the temperature reconstructions had errors.
A very important paper was published yesterday, discussing the feasibility of limiting global warming to 1.5°C when considering a range of existing constraints.👇
The findings are indeed daunting, but maybe not as hopeless as many on this website seem to imply...
Quick 🧵
2/ The study reviews chances of keeping global warming to within Paris Agreement bounds of 1.5C to 2.0C given the latest understandings of 5 key constraints: geophysical; technological; institutional; socio-cultural; and economic...
3/ They find that while it is possible - despite existing constraints - to remain below 1.6 °C of peak warming (which is a 'low overshoot' temperature which could eventually be brought back down to 1.5C), the *likelihood* of doing so is now below 50%...
2/ There've been many June heatwaves like this in the US before. And, the daily mean temp anomaly for Wednesday, June 19th (the peak day of the heat dome) wasn't very exceptional in much of the US East... (for that given day of the year).
3/ If we look at the month of June across the US SOUTHEAST going back to 1895, we can see that the region has been plenty warm before during the month of June (this record goes up to 2023)!
1) The thread noted a divide between what I called “accelerationists” who were sounding alarm that 2023’s remarkable warming was the beginning of SOMETHING NEW, and those I (later) called “observationalists”, who claimed 2023’s extreme warmth fits within EXPECTED WARMING trends.
2) These positions continue to be expressed. @MichaelEMann, for instance, is adamant that “the truth [about global warming] is bad enough”; that the warming we saw in 2023 can be explained by known climate physics; and that 2023 fits within the modelled warming.
This post by @FoodProfessor claims that the Trudeau Government purposely built the @ClimateInstit and @SP_Inst as part of its "lobbying machine" and that they are "mandated to advocate blindly" for the carbon tax.
This is a baseless claim.
Thread...🧵
1) This story starts in 1988 when the Mulroney government created an Independent advisory council of experts called the National Roundtable on the Environment and the Economy. For 25 years it produced numerous reports on environmental policy, advising governments.
2) Then in 2013 the Harper government cancelled the NREE's funding because it did not like the advice it was receiving (in particular regarding carbon pricing). News story about it here: cbc.ca/news/politics/…