Sustainability by numbers
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My new book — Clearing the Air — is published in the UK today
A Hopeful Guide to Solving Climate Change — in 50 Questions and Answers
55 mins ago
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Hannah Ritchie
47
1
The Electrotech Revolution: Some insights into a new way of thinking about the transition
From burning old sunshine to using it in real-time.
Sep 16
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Hannah Ritchie
149
45
Which countries are scaling solar and wind the fastest?
The leaderboard is quite different depending on what metric you look at.
Sep 9
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Hannah Ritchie
73
48
August 2025
What's the carbon footprint of using ChatGPT or Gemini? [August 2025 update]
A new study from Google suggests its Gemini LLM uses around 0.24 Wh per text query. That's the same energy as using a microwave for one second.
Aug 21
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Hannah Ritchie
175
33
How much do electric car batteries degrade?
Many electric cars will still have more than 80% of their initial capacity after 200,000 miles.
Aug 18
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Hannah Ritchie
242
31
July 2025
No, growing more food does not mean we always need more and more inputs
Many lower-income countries do, but high and middle-income countries have reduced fertilisers, pesticides, labour, and land without reducing food…
Jul 28
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Hannah Ritchie
162
34
Population growth or decline will have little impact on climate change
It'll be too slow and too late for the timeframes that we need to decarbonise.
Jul 15
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Hannah Ritchie
177
128
My new book — Clearing the Air — is coming out in September!
A Hopeful Guide to Solving Climate Change — in 50 Questions and Answers.
Jul 9
•
Hannah Ritchie
159
25
June 2025
How does geothermal energy work, and why don’t we use it more?
A primer on geothermal energy, and why it provides just 0.3% of the world's electricity.
Jun 30
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Hannah Ritchie
142
45
How big is the generational divide on climate change?
The generational divide on belief and concern about climate change is small; there are slightly bigger gaps in what to do about it.
Jun 19
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Hannah Ritchie
136
33
Under-the-hood of writing on Substack
Subscribers, revenue, and why more people should write long-form.
Jun 11
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Hannah Ritchie
300
54
Eating wild animals might be sustainable for the few, but not for the many
Some back-of-the-envelope calculations on how many it could feed.
Jun 2
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Hannah Ritchie
125
33
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