Prof. Katharine Hayhoe

Climate Scientist, Truth-Teller, Christ-Follower
Join me on Bluesky @katharinehayhoe.com
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[Prof. Katharine Hayhoe @KHayhoe]

I don't use X very much any more, but I'd love to see you elsewhere!

For the short & up to date content I used to provide here, see Threads & Bluesky.

For longer commentaries, see LinkedIn & my newsletter.

And for the fun stuff, check out IG + Pinterest.

All links below ⬇️

[Prof. Katharine Hayhoe @KHayhoe]

Looking for more from me than tweets? I regularly share unique content on a dozen other online platforms...and you won't see most of it on Twitter. Browse this thread for direct links and dive in!

[Prof. Katharine Hayhoe @KHayhoe]

Human-caused climate change has nearly doubled the likelihood of extreme fire weather in the Canadian Shield forests in 2025 and increased the likelihood of a third record-breaking year in terms of area burned by a factor of 10, new State of Wildfires report finds.

Read more: https://t.co/OSgJjT980U

[Catherine McKenna @cathmckenna]

Lack of climate action is especially worrying given recent report by ECCC scientists showing that Canadians already have to prepare for increasingly more severe wildfires, more extreme heat, rising seas...To avoid worst impacts, need to act now.
https://t.co/JdUjSXP8R4

[Prof. Katharine Hayhoe @KHayhoe]

I tackle misconceptions about climate change. My husband @DrAndrewFarley does the same with religion.

His new book, The Impossible Teachings of Jesus, is out today. Have we misunderstood the Sermon on the Mount for 2,000 years?

https://t.co/x5ZnflLxUT

[Prof. Katharine Hayhoe @KHayhoe]

🔋 Good news: For the first time on record, most new cars sold worldwide are no longer gasoline-only. And 94% of EV owners surveyed say they’ll never go back!

🌡️ Not-so-good news: The latest The Lancet Countdown on Health and Climate Change rightly calls for climate change to be recognized as the global health emergency it already is.

🍎 Inspiration: Ellenor Llona teaches chemistry in rural Indiana, where she's weaving climate science into her lessons - because students need to know what's happening, why it matters, and what we can do about it.

This week, take the time to find an answer to something you’ve wondered about on climate (chances are, I've covered it in my newsletter - try searching the archives!), then share what you learn with someone else.

You don't have to be a teacher like Ellenor to be a life-long learner!

https://t.co/mf4EreXwed

[Prof. Katharine Hayhoe @KHayhoe]

@Matt_S_Britton My dear man – I am literally one of the first people to tell the world about Eunice Foote.

Read any article about her. I am quoted in half of them.

Let’s talk about your foot instead – the giant one you just shoved in your mouth. How does that feel?

[Prof. Katharine Hayhoe @KHayhoe]

At the hearing for the deputy @NASA administrator today, nominee Jim Morhard was asked by @EdMarkey if he agrees with the scientific consensus that humans are the dominant influence on climate. He said he couldn't say.
Well, I'm a scientist, and I can. Here's why. (thread)

[Prof. Katharine Hayhoe @KHayhoe]

Tomorrow I'll be at the Alberta Rose Theatre in Portland OR for a conversation with @worldoregon on climate action and how we talk about it across our many divides.

If you're in the Portland area, come on out! Tickets available here:
https://t.co/12rYjNMEgP

[Prof. Katharine Hayhoe @KHayhoe]

Blocking someone for not being able to have a constructive conversation is not censorship. |⁣
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Science doesn't get settled in replies, it gets settled in journals, by people who spent decades learning how. My time goes to the work, not to arguing with the loudest voice in the comments.⁣
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Join me for a Cold Facts, Hot Takes grab bag, with comments from climate dismissives and the climate-concerned alike >> https://t.co/x1ecGQlwSx

[Prof. Katharine Hayhoe @KHayhoe]

🌊 Good news: In the Faroe Islands, scientists have measured Atlantic currents since 1993. Even as the ocean warms, the Faroe record is holding steady for now; and we only know that because someone kept measuring.

🌍 Very sad news: In rural Afghanistan, young girls who did almost nothing to cause climate change are paying its steepest price. Climate-driven droughts are decimating harvests and the resulting debt is forcing some families to marry off their daughters far too early.

🪺 What you can do: You can add to the climate record yourself and I have lots of links here of ways you can help, from logging seasonal changes to transcribing old handwritten weather records.

Read on and, as always, share what you learn with someone you know --

https://t.co/57RO7K1tDf

[Young Evangelicals for Climate Action @YECAction]

Our Senior Advisor, Dr. Katharine Hayhoe, recently developed an interactive tool to help you start #climateconversations in your everyday life! Get easy to remember talking points and conversation tips for any setting! https://t.co/CoCf976c7z

[Prof. Katharine Hayhoe @KHayhoe]

How a fake Loch Ness Monster helped bring a dammed-up river back to life -- and how climate change is coming for your pumpkins. Read on!

🌊 Good news: In Grand Rapids, they're ripping out century-old dams to bring the rapids back to the Grand River - and this 15-year initiative was catalyzed by a Nessie art installation.

🎃 Not-so-good news: This year the pumpkins took a beating worldwide, with drought, heat and flood decimating crops from North America to the UK.

📣 What you can do: In Australia, there’s still time to join Climate for Change’s Challenge for Climate: ten climate actions over ten days, through October 24. And in Canada, enter Canadian Geographic’s Live Net Zero Household Challenge by writing in the climate actions you’re already taking at home!

Even if you're not in Australia or Canada, tell someone why climate change matters to you this week. Most of us already care, we just have to say so out loud - and by doing so, we're "unsilencing the majority"! 💚
https://t.co/zhO4gVIfrP

[Engineer John @TheDXEngineer]

Is climate denialism on the rise? Or is it just the algorithms making it seem so? Climate scientist and communicator @KHayhoe of @TexasTech, @nature_org on the latest @wef #RadioDavos.

Episode page: https://t.co/sapTZUjadu
rt @wef

[Prof. Katharine Hayhoe @KHayhoe]

How a fake Loch Ness Monster helped bring a dammed-up river back to life -- and how climate change is coming for your pumpkins. Read on!

🌊 Good news: In Grand Rapids, they're ripping out century-old dams to bring the rapids back to the Grand River - and this 15-year initiative was catalyzed by a Nessie art installation.

🎃 Not-so-good news: This year the pumpkins took a beating worldwide, with drought, heat and flood decimating crops from North America to the UK.

📣 What you can do: In Australia, there’s still time to join Climate for Change’s Challenge for Climate: ten climate actions over ten days, through October 24. And in Canada, enter Canadian Geographic’s Live Net Zero Household Challenge by writing in the climate actions you’re already taking at home!

Even if you're not in Australia or Canada, tell someone why climate change matters to you this week. Most of us already care, we just have to say so out loud - and by doing so, we're "unsilencing the majority"! 💚
https://t.co/zhO4gVIfrP

[Prof. Katharine Hayhoe @KHayhoe]

This week I handed my newsletter to the one and only @queenofpeat, ecologist Merritt Turetsky. Her big idea? Stop treating wet land as a problem to drain. Start seeing it as something to work with instead!

🌿 Good news: A new approach called paludiculture flips the script: instead of draining peatlands to farm them, it keeps them wet and grows what actually thrives there: cattails for insulation, sago for food, and much more.

🔥 Not-so-good news: When a peatland is drained, it turns from a carbon vault to carbon source. A single drained bog the size of Manhattan can release as much CO₂ as burning a few hundred thousand pounds of coal a day.

🐸 What you can do: Become a bog champion: visit a local wetland and learn what lives there, ask your garden store to drop peat-based compost, and back the groups working to protect peatlands! For more, check out Merritt's new book, Bogland.

This week, plan a visit to a wetland near you. We can’t protect what we don’t know and appreciate, and action begins the moment we start to care 💚

https://t.co/6sNojqkNz1

[Prof. Katharine Hayhoe @KHayhoe]

At this year's NY Climate Week, the biggest positive change I saw wasn't the buzz about some new technology or policy. It was people finally realizing that talking about climate is where action starts. 👏 👏 👏

🗣️ Good news: For the first time ever there were more events on climate communication than I could attend, nearly 50 -- from a climate storytelling masterclass to Sesame Street's Elmo to our Talking Climate Collaborative launch. This tells me that communication is finally starting to be treated as the work itself, rather than an afterthought 😅

📢 Not-so-good news: What people believe is shaped less by the facts and a lot more by what whoever they trust tells them. This year, climate misinformation was coming from the US president at the UN podium ... which is exactly why who chooses to speak up matters so much.

🤝 What you can do: The most trusted messenger on climate isn't a scientist or an activist. It's someone people already know and trust. Which means, to the people you know, it's you!

So this week, share one thing you've learned with a community you're part of, and be brave enough to bring it up with someone who's never heard you say it.

Talking about climate isn't optional. It's where change begins 💚

https://t.co/URAVvIyFHm

[Prof. Katharine Hayhoe @KHayhoe]

Imagine a room full of brilliant jazz musicians, all playing solos, and none of them listening to each other. That's climate communication right now — and we have the data to prove it.

Join us TODAY at 3pm ET where I'll be sharing why we're building the Talking Climate Collaborative.

We'll unpack what our data says - some things you'd expect, but others that are sure to surprise- and take you through what we've already built, including our Start a Conversation virtual flash cards, and what's coming next.

Can't make it? Register anyway and we'll send you the recording -> https://t.co/AhG7fbOE2S

[Dr. Leah C. Stokes [email protected] @leahstokes]

“'Unlike A.I., climate change’s existential threat is not hypothetical. It is killing people now,' Dr. Stokes wrote. 'It also feels like a lot of people have conveniently forgotten about the urgency of solving this problem.'”

Amidst the AI-pocalypse, we can't lose sight of the climate crisis and the urgency of electrification. Gift link!
https://t.co/V166J1w3Jt

[Prof. Katharine Hayhoe @KHayhoe]

Many of us eat meals we had no hand in planning, whether at school, at work, or in the hospital. Often, we assume there's nothing we can do about them ... but one hospital just proved otherwise. Read on!

🍽️ Good news: At a Vancouver hospital, psychology & sustainability researchers teamed up with a chef, dietitians, and doctors to create new fish- and plant-rich dishes patients loved. Nutrition went up, food-related emissions went down, and more than 20 other hospitals are following suit!

🐟 Not-so-good news: As oceans warm, the algae at the base of the marine food web are making fewer of the omega-3s our eyes, brains, and hearts depend on. That shortfall travels all the way up to the fish on our plates.

🙋🏻‍♀️ What you can do: The kitchens at your school, workplace, or church serve more food in a week than you'll cook in a year. This makes them one of the highest-impact places to change what's on the plate.

This week, find out who plans the menu at a cafeteria where you eat, and ask if they'd add more healthy and plant-rich options. You don't need a plan, a budget, or a title, just the willingness to ask 💚

https://t.co/GPZT3dlojn

[Prof. Katharine Hayhoe @KHayhoe]

Is the climate movement getting in our own way? 👀

Sometimes, we're so busy picking apart how our allies talk about climate change that we lose sight of what we're all trying to accomplish.

Adam Met from AJR and Planet Reimagined and I talk about climate hushing, why we can't let perfect be the enemy of good, and how we can spend less time fighting each other and more time moving solutions forward.

Because we have enough obstacles to overcome without becoming obstacles for each other.

Become a paid subscriber to watch the full video and support more conversations like this one. https://t.co/UEiMXURtSl

[Prof. Katharine Hayhoe @KHayhoe]

@meneer_pastoor @TIME Seems you didn’t read this previous essay. Please do! https://t.co/71uk1BTbEy