A real privilege to welcome Dr. Kate Hanneman to the University of Calgary this week as our Visiting Professor. Her talk on sustainability in medical imaging and planetary health was both inspiring and practical. Excited to keep pushing these conversations forward here in Calgary!🌱 🩻 🌎

“How should Canada respond to Charlie Kirk's murder? Doing better here in Canada means refusing to import the worst elements of America’s ongoing culture war into our own politics.” @maxfawcett.bsky.social

🚲 𝗘-𝗯𝗶𝗸𝗲𝘀 𝗮𝗿𝗲 𝗮𝗺𝗼𝗻𝗴 𝘁𝗵𝗲 𝗺𝗼𝘀𝘁 𝗲𝗳𝗳𝗶𝗰𝗶𝗲𝗻𝘁 𝘁𝗿𝗮𝗻𝘀𝗽𝗼𝗿𝘁𝗮𝘁𝗶𝗼𝗻 𝗱𝗲𝘃𝗶𝗰𝗲𝘀 𝗲𝘃𝗲𝗿 𝗶𝗻𝘃𝗲𝗻𝘁𝗲𝗱. 🚙 Cars? Among the least. E-bike: 20–30 Wh/km [1] Walking: 50–70 Wh/km [2] Light rail: 80–120 Wh/km [3] EV car: 150–200 Wh/km [4] Gas car: 600–800 Wh/km [5] Imagine if we built our cities around the most efficient ride.

Early evidence suggests bi-parametric prostate MRI may bring: 💰 lower costs ⏱️ faster scans ⚠️ safer (no contrast) 🌱 smaller environmental footprint Good for patients. Good for taxpayers. Good for the planet. ✅ ✅ ✅ #radsky

❓𝗪𝗵𝗮𝘁 𝗱𝗼𝗲𝘀 𝘀𝘂𝘀𝘁𝗮𝗶𝗻𝗮𝗯𝗶𝗹𝗶𝘁𝘆 𝗵𝗮𝘃𝗲 𝘁𝗼 𝗱𝗼 𝘄𝗶𝘁𝗵 𝗿𝗮𝗱𝗶𝗼𝗹𝗼𝗴𝘆? 🏥 Healthcare = 5% of global CO2 pollution. 🩻 Radiology = 1/5 of that. (✈️ For perspective, aviation is ≈2%.) ⚡ CTs waste ~⅔ of their energy. ⚡ MRIs waste ~⅓. Rads, techs, industry all have a role. 🤝 Healthy planet = healthier patients. 🩺🌍

Even if you wrapped the entire planet in oil and gas wells, they’d still end up as stranded assets as the world moves on to cleaner (and cheaper) energy. One of the biggest mistakes fossil fuel execs can make is equating SHORT-TERM PROFITS with LONG-TERM REALITY!

If Canada’s CO₂ emissions fell to zero, the climate would barely notice—we emit <2% of global total. Its a familiar argument: “𝙊𝙪𝙧 𝙘𝙤𝙪𝙣𝙩𝙧𝙮’𝙨 𝙚𝙢𝙞𝙨𝙨𝙞𝙤𝙣𝙨 𝙖𝙧𝙚 𝙣𝙚𝙜𝙡𝙞𝙜𝙞𝙗𝙡𝙚. 𝙄𝙩 𝙙𝙤𝙚𝙨𝙣’𝙩 𝙢𝙖𝙩𝙩𝙚𝙧 𝙬𝙝𝙖𝙩 𝙬𝙚 𝙙𝙤.” And I get it—graphs like this 𝘤𝘢𝘯 make us feel powerless. But here’s why our actions 𝘥𝘰 matter: 🧵

Exxon in 1977 (quietly): CO₂ from fossil fuels, per our own scientists, will warm the planet. 🤐 Exxon in 2000: Who can really say if fossil fuels are warming the planet, the science is just too complicated to know. 🤷‍♂️ Exxon now: Okay you were right. But we are totally going to techno-fix it now! 😇

Canada and the U.S. blaming climate change on “China and India” is like a mansion cranking the AC to 18 °C all summer, then blaming the apartment complex down the street — which doesn’t even have AC — because their total power bill is bigger. (Never mind the fact that 400 people live there.)

Our American neighbours are trying to reverse the global #energytransition. It’s a fool’s errand, and Canada should not join it. 🇨🇦 🇺🇸 ⚡️

𝗧𝘄𝗼 𝗺𝗮𝗽𝘀. 𝗢𝗻𝗲 𝗹𝗼𝗼𝗺𝗶𝗻𝗴 𝗰𝗿𝗶𝘀𝗶𝘀. 🗺️ 1: Where people live (population density, 2025). 🗺️ 2: Where people are most vulnerable to climate change (IPCC, 2022) What happens when the 𝙢𝙤𝙨𝙩 𝙥𝙤𝙥𝙪𝙡𝙖𝙩𝙚𝙙 𝙧𝙚𝙜𝙞𝙤𝙣𝙨 also become the 𝙡𝙚𝙖𝙨𝙩 𝙝𝙖𝙗𝙞𝙩𝙖𝙗𝙡𝙚? 🌍 Mass migration 🌾 Food insecurity ⚔️ Conflicts 🧭 Global instability

“Sure, Donald Trump might be able to slow the progress of electrification and renewable energy in America, but he’ll just as surely speed it up in the rest of the world in the process. Which side of that divide do we really want to be on in the end?” Max: 1 | Fossil lobby fiction: 0

It is endlessly hilarious to me that the 5 denier scientists they are able to dig up for this ... are the same 5 denier scientists they were able to dig up 10 years ago, and 20 years ago. One might ask why no new scientists are joining this faction. Must be the global conspiracy.

Carbon capture actually makes me angrier than almost anything in climate policy. It’s been 50 years of wildly expensive pilot projects—and a major project still hasn’t delivered on promised emissions reductions. Not once. But sure, it’s a “common sense” solution. 🙃 Rant 🧵 ⬇️ 1/n

The "worst-case scenario of famine" is unfolding in Gaza under Israel’s military assault, the world's leading body on hunger said.

Fiscally conservative: Put a market price on carbon and let the free market decide the best path to decarbonization. Not fiscally conservative: Block renewables with red tape while handing out taxpayer money to oil companies for carbon capture—a “work in progress” since the 1970s.

Few things illustrate the absurdity of North American car dependency better than this: most households consume more energy powering their cars than they do running their entire homes on electricity.

If you care about climate, you must understand this thing

The most under-told fact about COVID: The world’s 10 richest men more than doubled their wealth—from $700B to $1.5T. At the same time, 99% of humanity got poorer, 160M+ pushed into poverty. The largest upward transfer of wealth in human history became background noise to fights about masks.

“Too late” for what? 1.5°C? Likely. But 2.5°C is better than 3°C, and 3°C is better than 4°C. It’s not all-or-nothing. Yes, there are tipping points — but doom messaging risks paralysis. Every fraction of a degree avoided still makes a difference — for lives, ecosystems, and the future. #ClimateSky

Love @katharinehayhoe.com’s analogy for climate change—a pool filling by a hose—CO₂. We can turn down the hose (cut emissions), widen the drain (carbon removal), or learn to swim (adapt). But what about 𝗺𝗲𝘁𝗵𝗮𝗻𝗲—𝟴𝟬× 𝗺𝗼𝗿𝗲 𝗽𝗼𝘁𝗲𝗻𝘁 𝘁𝗵𝗮𝗻 𝗖𝗢₂? It’s a cannonball. Sudden splash. Big spike. 💣💦 🌍 #ClimateSky

As a nuclear medicine physician and climate advocate, I support renewables first. But we shouldn’t dismiss nuclear — it’s among the 𝘭𝘰𝘸𝘦𝘴𝘵-𝘦𝘮𝘪𝘴𝘴𝘪𝘰𝘯, 𝘭𝘰𝘸𝘦𝘴𝘵-𝘮𝘰𝘳𝘵𝘢𝘭𝘪𝘵𝘺 energy sources we have. Yes, uranium must be mined — but it’s 𝙢𝙞𝙡𝙡𝙞𝙤𝙣𝙨 𝙭 𝙢𝙤𝙧𝙚 𝙚𝙣𝙚𝙧𝙜𝙮-𝙙𝙚𝙣𝙨𝙚 than fossil fuels. 🪨⚛️ 💪 #ClimateSky

We invented dirt-cheap magic sky panels that turn sunlight into electricity. But instead, society said: “Let’s keep digging up dino sludge, light it on fire, and then pay billions to 𝙢𝙖𝙮𝙗𝙚 try stuffing the smoke back underground. Common sense. Fiscally responsible.”

📀 Netflix started with DVDs. Then it pivoted—early and boldly—to streaming. 📡 Alberta can do the same. We have the talent, tools, and capital to lead in clean energy—if we stop doubling down on the past and start building what’s next. ⚡️🔋☀️ #energytransition #climatesky

Congrats @katehanneman.bsky.social —huge to see this work on air pollution & heart health land on the front page! Hope it helps drive real policy change. 🫀🌫️📰 #climatesky #radsky #medsky

Let’s talk about “hydrogen”. It has been sold as a high-tech pivot away from fossil fuels. 🧪 ⚛️ But 𝗮 𝗦𝘁𝗮𝗻𝗳𝗼𝗿𝗱/𝗖𝗼𝗿𝗻𝗲𝗹𝗹 𝘀𝘁𝘂𝗱𝘆 𝗳𝗼𝘂𝗻𝗱 𝘁𝗵𝗮𝘁 𝗯𝗹𝘂𝗲 𝗵𝘆𝗱𝗿𝗼𝗴𝗲𝗻—made from natural gas + carbon capture—may be 𝘄𝗼𝗿𝘀𝗲 𝗳𝗼𝗿 𝘁𝗵𝗲 𝗰𝗹𝗶𝗺𝗮𝘁𝗲 than just burning natural gas. 🔥 👉 Sometimes, it’s even 𝗺𝗼𝗿𝗲 𝗽𝗼𝗹𝗹𝘂𝘁𝗶𝗻𝗴 𝘁𝗵𝗮𝗻 𝗰𝗼𝗮𝗹.

Took the family to the Tyrrell Museum—dinos and childhood awe. 🦖 But walking deep through time, I couldn’t shake it: species are 𝙫𝙖𝙣𝙞𝙨𝙝𝙞𝙣𝙜 𝙛𝙖𝙨𝙩𝙚𝙧 𝙩𝙤𝙙𝙖𝙮 than after the asteroid that killed the dinosaurs. 𝘛𝘩𝘦 𝘴𝘪𝘹𝘵𝘩 𝘦𝘹𝘵𝘪𝘯𝘤𝘵𝘪𝘰𝘯 isn’t on a placard yet. The hope? We can still choose a different ending. ☀️

Saw @katharinehayhoe.com speak in Calgary tonight. Her message: • You are 𝘯𝘰𝘵 𝘢𝘭𝘰𝘯𝘦 in climate anxiety. • It is 𝘳𝘢𝘵𝘪𝘰𝘯𝘢𝘭. • Most people 𝘥𝘰 care — just don’t know what to do. • Talk about it. Bonus: CCUS & DAC = niche last-resorts, not silver bullets. Extra bonus: she complimented my SDG pin 🤓

“We treat smoke like weather. We build apps to manage it. We compare it to last year’s average. We forget that just a decade ago, this level of smoke wasn’t “summer.””

The scariest part of climate collapse is how ordinary it’s starting to feel. This week, I wrote in Canada’s National Observer about smoke season, moral injury, and raising kids in a world that shrugs it off. #ClimateSky

🔥 As wildfire smoke blankets Calgary, the OPEC Secretary-General calls net-zero targets “unrealistic.” 🌍 Meanwhile, climate scientists warn 𝙣𝙚𝙩-𝙯𝙚𝙧𝙤 𝙞𝙨 𝙖𝙡𝙧𝙚𝙖𝙙𝙮 𝙩𝙤𝙤 𝙡𝙞𝙩𝙩𝙡𝙚, 𝙩𝙤𝙤 𝙡𝙖𝙩𝙚—unproven tech to justify more fossil fuels today. 𝗡𝗲𝘁-𝘇𝗲𝗿𝗼 𝗶𝘀𝗻’𝘁 𝗿𝗮𝗱𝗶𝗰𝗮𝗹. 𝗜𝘁’𝘀 𝘁𝗵𝗲 𝗯𝗮𝗿𝗲 𝗺𝗶𝗻𝗶𝗺𝘂𝗺. #ClimateCrisis

𝗙𝗼𝘀𝘀𝗶𝗹-𝗳𝘂𝗲𝗹𝗲𝗱 𝗴𝗹𝗼𝗯𝗮𝗹 𝘄𝗮𝗿𝗺𝗶𝗻𝗴 𝗶𝘀 𝗺𝗮𝗸𝗶𝗻𝗴 𝗺𝘆 𝗰𝗮𝗹𝗹 𝘀𝗵𝗶𝗳𝘁𝘀 𝗯𝘂𝘀𝗶𝗲𝗿. Literally. A study of 𝟭.𝟲 𝗺𝗶𝗹𝗹𝗶𝗼𝗻 ED imaging exams found daily spikes due to: 🔥 𝗛𝗲𝗮𝘁 → +5.1% 🌫️ 𝗣𝗠₂.₅ → +4.0% 𝗖𝗹𝗶𝗺𝗮𝘁𝗲 𝗰𝗵𝗮𝗻𝗴𝗲 𝗶𝘀𝗻’𝘁 𝗮𝗯𝘀𝘁𝗿𝗮𝗰𝘁. It’s showing up in the 𝘄𝗮𝗶𝘁𝗶𝗻𝗴 𝗿𝗼𝗼𝗺 and the 𝗣𝗔𝗖𝗦 𝗾𝘂𝗲𝘂𝗲. 🧾 Hanneman et al, Radiology, 2024

𝗔𝗰𝗰𝗲𝗽𝘁𝗶𝗻𝗴 𝗰𝗹𝗶𝗺𝗮𝘁𝗲 𝗰𝗵𝗮𝗻𝗴𝗲 𝗺𝗲𝗮𝗻𝘀 𝗺𝗼𝗿𝗲 𝘁𝗵𝗮𝗻 𝗮𝗰𝗸𝗻𝗼𝘄𝗹𝗲𝗱𝗴𝗶𝗻𝗴 𝘄𝗮𝗿𝗺𝗶𝗻𝗴. It means: 🏭 Naming 𝘧𝘰𝘴𝘴𝘪𝘭 𝘧𝘶𝘦𝘭𝘴 as the 𝐩𝐫𝐢𝐦𝐚𝐫𝐲 𝐝𝐫𝐢𝐯𝐞𝐫 ☀️ Naming 𝘤𝘭𝘦𝘢𝘯 𝘦𝘯𝘦𝘳𝘨𝘺 as the 𝐬𝐨𝐥𝐮𝐭𝐢𝐨𝐧 Yes, agriculture, land use, and carbon capture matter. But don’t lose the plot: 𝗖𝗹𝗶𝗺𝗮𝘁𝗲 𝗰𝗵𝗮𝗻𝗴𝗲 𝗶𝘀, 𝗼𝘃𝗲𝗿𝘄𝗵𝗲𝗹𝗺𝗶𝗻𝗴𝗹𝘆, 𝗮 𝗳𝗼𝘀𝘀𝗶𝗹 𝗳𝘂𝗲𝗹 𝗽𝗿𝗼𝗯𝗹𝗲𝗺.

Thankfully, the village was evacuated already, but one person is missing and everyone else’s homes are destroyed. Make no mistake: this is a climate disaster.

𝗦𝗽𝘂𝗿𝗶𝗼𝘂𝘀 𝗰𝗼𝗿𝗿𝗲𝗹𝗮𝘁𝗶𝗼𝗻𝘀 𝗮𝗿𝗲 𝗳𝘂𝗻𝗻𝘆—𝘂𝗻𝘁𝗶𝗹 𝘁𝗵𝗲𝘆 𝗳𝗹𝗼𝗼𝗱 𝘁𝗵𝗲 𝗯𝗶𝗼𝗺𝗲𝗱𝗶𝗰𝗮𝗹 𝗹𝗶𝘁𝗲𝗿𝗮𝘁𝘂𝗿𝗲. New analysis in 𝘕𝘢𝘵𝘶𝘳𝘦 found over 2,200 papers in 2024 alone mining NHANES for statistically significant (but often meaningless) associations. Many articles formulaic, likely AI-generated. 📊 Tyler Vigen | 📰 bit.ly/4dxB1hK

Just landed at Toronto Pearson and my phone auto-prompted me to add a PRESTO card. UP Express is faster and cheaper than a cab, but many default to taxis—transit feels daunting if your last memory is paper tickets. Smart nudges like this make a difference. Good UI is good policy. ✈️🚆 #ClimateSky

Plastic recycling was never just a policy failure — it was a 𝘤𝘩𝘦𝘮𝘪𝘴𝘵𝘳𝘺 problem. 🪨 Metals: • Value in the 𝑒𝑙𝑒𝑚𝑒𝑛𝑡𝑎𝑙 𝑎𝑡𝑜𝑚𝑠 — 𝐜𝐨𝐩𝐩𝐞𝐫, 𝐧𝐢𝐜𝐤𝐞𝐥, 𝐥𝐢𝐭𝐡𝐢𝐮𝐦 • You can melt & recover them 🛢️ Plastics: • Value from 𝑚𝑜𝑙𝑒𝑐𝑢𝑙𝑎𝑟 𝑠𝑡𝑟𝑢𝑐𝑡𝑢𝑟𝑒, not elements • Recycling breaks structure — leading to 𝑤𝑒𝑎𝑘𝑒𝑟 material

𝗠𝗲𝗱𝗶𝗰𝗮𝗹 𝘀𝗰𝗼𝗿𝗶𝗻𝗴 𝘀𝘆𝘀𝘁𝗲𝗺𝘀 𝗜 𝗱𝗲𝗲𝗽𝗹𝘆 𝗿𝗲𝘀𝗽𝗲𝗰𝘁: • 𝗕𝗣𝗣: 0-or-2-point system where amniotic fluid is secretly the most important. But don’t worry, we’ll just keep all components equally weighted. • 𝗪𝗲𝗹𝗹𝘀 𝗦𝗰𝗼𝗿𝗲: “Is PE the most likely diagnosis?” Cool—+3 points for… thinking it’s PE. Any others? 👇 #MedSky

According to some: 🔥 Using fossil fuels to make hydrogen, building an entirely new grid to deliver it to homes for heating & cooking: “Practical” “Real world” “Common sense” 🔌 Using the existing electricity grid to power heat pumps & induction stoves: “Radical” “Extreme” “Ideological” #ClimateSky

Today I learned (ok, probably old news to climate wonks) that most utilities forbid homeowners from installing more solar than they use — so they don’t “oversupply” the grid. Framed as “grid equity” — but really just climate-sabotaging market distortion. ☀️🫠 #ClimateSky

I’ve worked in 3 provinces as a radiologist, and Alberta’s biggest strength is its 𝘂𝗻𝗶𝗳𝗶𝗲𝗱 𝗵𝗲𝗮𝗹𝘁𝗵 𝗮𝘂𝘁𝗵𝗼𝗿𝗶𝘁𝘆. Shared protocols, care paths, imaging archives—it works. 🗂️ 🩻 ⚡️ Now we’re spending nearly $𝟏𝟎𝟎𝐌 to break AHS into 4 silos for political optics? That’s not reform. That’s regression. 💸

Tragic and infuriating.

Hey Calgarians! Want to hang out with an amazing climate hero? Dr. Katherine Hayhoe is coming to town! June 22nd. from the @calgaryclimatehub.ca www.calgaryclimatehub.ca/an_evening_w...

ITER just powered up the world’s most powerful magnet—a huge step for fusion energy. Fusion could someday give us near-limitless clean power—but that day’s not today. 🧲 ☢️ For now, it’s renewables and fission we need to meet our urgent climate goals. ☀️🌿 #ClimateSky

Interesting discussion from @nejm.org As opportunistic screening expands—wearables, coronary calcium on CT, BMD on x-rays, breast arterial calcification—we urgently need outcomes-based evidence to guide management. Without it, we risk both over- and undertreatment. #MedSky #CardioSky #RadSky 🫀🦴🩻

Yes, renewable energy has its hurdles—grid stability, storage and land use. And yes, there is spin on both sides. But only one side directly profits from the status quo. We should be 𝙛𝙖𝙧 more skeptical of those with a vested interest in fossil fuels. That’s just common sense. 💰🛢️ #ClimateSky

“Three strikes” laws like the one Poilievre wants are simplistic and costly. They don’t reduce crime—just increase incarceration, especially for marginalized groups. Want real public safety? Address poverty, addiction, trauma, and mental illness. ⚖️ 💸 #cdnpoliA

Long overdue. Ridiculous that brand new houses have to be retrofitted for today’s world. Baking in disaster

⚡️ Electricity is electricity. The final product of a solar farm or coal plant is identical. If we prefer coal & gas — despite being dirtier — because they “create more jobs,” can we just admit fossil fuel power stations are a planet-destroying make-work project? #ClimateSky 🌍

I had to check if this was real. It is. We have a US president lobbying our annexation, who's threatened economic force to do so. Unprecedented. Today we're choosing who fights for this country. Who stands up for Canada & resists the right-wing populism that led our neighbour to this place. Vote.