By the Numbers
Hannah RitchieUsing data and research to understand what really makes a difference
| Platform |  | Pricing | Only free issues | Publishes | Weekly |
|---|---|---|---|---|---|
| Issues | 158 | Founded | 4 years ago | Last Issue | 13 days ago |
| Active | |||||
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hannahritchie.substack.comLatest Issues
Do more Europeans die of summer heat than Americans die of guns?
The chart below has been doing the rounds on social media. The headline is really about how poorly Europe protects people from heat. But the flip is also true for America and guns. European policy protects people against guns, but not heat;...
What will future population change look like?
The huge declines in global fertility rates — and what this means for population growth and age structures going forward — gets a lot of attention these days.1
Much of these discussions use the United Nations’ population projections as the...
How much electricity does AI consume? [2025 summary]
Over the past year, I’ve written a few articles about the energy (and carbon) footprint of individual use of artificial intelligence, mostly in the form of asking LLMs (or chatbots) questions.
The problem is that until recently, the latest...
Receiving the Unwin Award
A very short post today.
Last week I was in London for the Unwin Award Ceremony. It was held at the Royal Institution. Special as it’s where they’d host the infamous Science Christmas Lectures I watched as a kid on television.
I was one o...
Are only one-third of Britain’s railways electric?
Over the last few years, I’ve seen numerous graphics and social media posts similar to the ones below. They show what share of different countries’ railway lines are electrified. Most of the rest run on diesel.
The focus of the post is alw...
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