Simon Donner

@simondonner.bsky.social

Climate scientist, prof at UBC, writer, speaker, aquatic mammal, dragger of sand into the house.

I too wish that the wildfire smoke spreading across the eastern US and Canada would inspire deep, sustained action to reduce climate-warming emissions. We've been here many times before, mistakenly thinking that "this" will be the event that tips the scale towards action. (1/2)

As smoke from heatwave-fueled wildfires spreads across eastern US and Canada, the National Academy of Sciences releases a report confirming the link between extreme events and climate change. Coincidence? Yes... but a likely one given the rise in extremes. www.nationalacademies.org/publications...

Attribution of Extreme Weather and Climate Events and Their Impacts 2026

Decades of data and research indicate that human-caused climate change is altering the frequency and intensity of several types of extreme events, such as...

nationalacademies.org

Michael E. Mann@michaelemann.bsky.social · 3w ago

My comments on the new @nationalacademies.org report on climate change & extreme weather attribution. The TLDR statement: If anything, the academy understates the strength of the science linking increasingly extreme weather events to climate change: michaelmann.net/comments-on-...

Appreciate how the U.S. media coverage of the terrible wildfire smoke pretty much always labels the wildfires "Canadian", as if our Parliament met and voted to export smoke to the U.S.

High overnight temperatures are a key fingerprint of human activity on the climate. The planet is warming faster when you are asleep, in part because unlike the sun, greenhouse gases warm the planet 24 hrs a day. Here is the daytime high vs. overnight low temperature trends for Canada since 1948.

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When I look at heatwave forecasts, I focus on that overnight low, like the shocking 27 C for NYC. "Tropical nights", when temps stayed above 20 C / 68 F, drove much of the mortality during past European heatwaves, and 2021 Pacific NW heat dome. Inability to cool off overnight is the silent killer.

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Record daytime high temperatures and heat indices are getting all the attention in this N American heatwave, as in the recent European heatwave. As big a health risk is the high overnight temperatures; inability to cool off overnight is a primary driver of sickness and death during heatwaves.

Since the sweltering day 38 years ago that James Hansen sat in front of the US Congress and announced that global warming "is here", we keep making the mistake of thinking this will be the heat wave, the storm, the flood that forces the world to take climate action. (1/3)

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The European heatwave is not the new normal. "Normal" is going to keep changing until we stop adding greenhouse gases to the atmosphere. The more we emit, the more the planet warms, the more people suffer, that is the basic math of climate change.

A key feature of the devastating European heatwave is the timing. Summer heatwaves are most common in late July and early August, as in 2003 when >70,000 people died. This one is right at the summer solstice, which while early, means longer days and less time for the land to cool off overnight.

Check out this new limited podcast from @nationalobserver.com that traces the five stages of grief about our rapidly changing world. In episode 2, I have some blunt things to say about the harms done by clickbait climate doom-ism.

Daniel J. Pierce@danieljpierce.bsky.social · last mo.

Episode 2 of our new podcast for @nationalobserver.com is out now on Apple, Spotify or wherever you get your podcasts. EP2 looks at climate denial – the psychology, propaganda and the role of the courts in cutting through the disinformation and forcing governments to act. @simondonner.bsky.social

New modelling supports what many have been saying about the Canada-Alberta deal. It is bad emissions math. This may lock Canada into a industrial C pricing system that is far too weak to make up for concessions around a new pipeline, carbon capture, etc. 440megatonnes.ca/insight/cana...

New analysis finds Canada-Alberta MOU leaves emissions largely unchanged

The Canada-Alberta MOU substantially changes how climate policy works in Canada, but does little to improve Canada's long-term emissions ...

440megatonnes.ca

Hope for meaningful emissions cuts from industrial pricing now rest heavily on negotiations around tightening the emissions benchmarks and the delivery of "contracts for difference", which encourage companies to act by locking in the future carbon price (regardless of future policy changes). (1/2)

One of the biggest challenges in climate action is imagining what a better future could actually look like: especially when solutions are so often framed as sacrifices that require loss, instead of opportunities to benefit from. This week's good news and what-to-do takes those on directly!

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