Simon Donner

Bluesky @simondonner.bsky.social

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Followers

15.3K

Account age

2 yrs

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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.

104 views 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.

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)

69 views 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)

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.

27 views 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.

When I resigned from chairing Canada's Net-Zero Advisory Body last December, we had completed an annual report (www.nzab2050.ca/publications...) full of climate policy advice.

I recommend reading the introduction to the report, if not the whole report, which remains timely. Here's an excerpt:

18 views When I resigned from chairing Canada's Net-Zero Advisory Body last December, we had completed an annual report (www.nzab2050.ca/publications...) full of climate policy advice. I recommend reading the introduction to the report, if not the whole report, which remains timely. Here's an excerpt:

📊 Post engagement

Avg engagement / post

0.2%

Engagement vs followers

Sep 2023

On Bluesky since

🔥 Top post: When I look at heatwave forecasts, I focus on that overnight low · 104 likes + reposts

📊 Activity & format

Posting cadence

4 / week

Posts several times a week.

Content mix

Mostly text

Recent: 8 text · 4 image · 0 video.

Follower / following

21×

Follows 721 back. A strong ratio — an audience that follows them, not a follow-for-follow network.

Recent posts

View on Bluesky ↗

🔥 Top post 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… ★ 104

I appreciate how the Marvel movies are going full Fast and the Furious, just bringing back characters that definitely died or disappeared in a previous film. ★ 4 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 … ★ 30 Let's not fuel this BS again, it is purely about getting attention... the four Republicans or their social media teams probably don't even believe what they are saying. www.cbc.ca/news/politic... ★ 16 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 th… ★ 10 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. ★ 16

When I resigned from chairing Canada's Net-Zero Advisory Body last December, we had completed an annual report (www.nzab2050.ca/publications...) full of climate policy advice. I recommend reading the introduction to the report, if not th… ★ 18 Read Alan's post for details on the dangerously warm overnight low temperatures during the July 4th weekend heatwave. ★ 12

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 … ★ 27 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 … ★ 20 Definitely would not have predicted that the only player remaining from the Raptors championship team seven years later would be Kawhi Leonard. ★ 6

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 wo… ★ 69

🦋 Handle & authenticity

Bluesky handle

@simondonner.bsky.social

A default .bsky.social handle — genuine, but not domain-verified. Confirm identity before a high-value deal.

On Bluesky since

Sep 2023

An early adopter from the invite-only beta (before the Feb 2024 public launch) — an original, established account.

💡 Facts

🗓️Joined Bluesky in 2023 — 2 years ago.

👁️Averages 28 views per post.

📤Posts about 4× per week.

🏅Earned the 10K Followers for passing 10K followers.

🕵️ Fake follower check

Estimated

67/100

Good Credibility score

89%

Real Real audience

Low Fake-follower risk

High Data confidence

Est. 89% real, active audience · Low fake-follower risk.
Engagement (~0.2% of followers engage each post) is around typical for Bluesky.
Organic base — far more followers than accounts it follows.

Heuristic estimate from engagement, follower ratios, account age & growth — a screening signal, not a guarantee.

About

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

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🔀 Audience overlap

Estimated

Estimated shared audience with similar creators — useful for avoiding overlap (or doubling down) when planning a campaign.

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Simon Donner

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