By the Numbers

hannahritchie.substack.com ↗

Using data and research to understand what really makes a difference

Items: 40

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💌 How much do electric car batteries degrade?
published 12 months ago
💌 What's the carbon footprint of using ChatGPT or Gemini? [August 2025 update]
published 12 months ago
💌 Which countries are scaling solar and wind the fastest?
published 11 months ago
💌 The Electrotech Revolution: Some insights into a new way of thinking about the transition
published 11 months ago
💌 My new book — Clearing the Air — is published in the UK today
published 11 months ago
💌 The world is on track for record harvests this year
published 11 months ago
💌 Eliminating contrails from flying could be incredibly cheap
published 10 months ago
💌 How unprecedented is power demand growth in the United States?
published 10 months ago
💌 Artificial intelligence could dramatically improve weather forecasting
published 9 months ago
💌 Deforestation in the Brazilian Amazon has fallen again in 2025
published 9 months ago
💌 What happened to global carbon emissions this year?
published 9 months ago
💌 Will oil and gas consumption keep rising through 2050?
published 9 months ago
💌 What happened on energy and climate in China this year?
published 8 months ago
💌 Can we break the human development-environment trade-off?
published 8 months ago
💌 Some changes to Sustainability by Numbers in the new year
published 7 months ago
💌 Five(ish) charts that give some context to Venezuelan oil
published 7 months ago
💌 The low life expectancy of Americans is not just about deaths among young people
published 7 months ago
💌 Many people are individually optimistic but think the world is falling apart
published 7 months ago
💌 Are bees booming or dying off?
published 6 months ago
💌 We could produce a lot of electricity on the land used for biofuels
published 6 months ago
💌 The changing (and perhaps surprising) geography of diabetes
published 6 months ago
💌 Do subsidies make meat much cheaper?
published 6 months ago
💌 Does that use a lot of energy?
published 5 months ago
💌 My book is published in the US today, and I'm shortlisted for the Unwin Award
published 5 months ago
💌 Does that use a lot of energy? [Update]
published 5 months ago
💌 Does China have a huge electricity advantage over the United States?
published 5 months ago
💌 Will Africa still be energy-poor in 2050?
published 4 months ago
💌 Technology can cut plane contrails by two-thirds. Getting airlines to use it isn't so easy
published 4 months ago
💌 The UK is cutting its aid budget to the lowest level in decades
published 4 months ago
💌 An end to cervical cancer is possible
published 3 months ago
💌 Are only one-third of Britain’s railways electric?
published 3 months ago
💌 Receiving the Unwin Award
published 3 months ago
💌 How much electricity does AI consume? [2025 summary]
published 3 months ago
💌 What will future population change look like?
published 2 months ago
💌 Do more Europeans die of summer heat than Americans die of guns?
published 2 months ago
💌 How quickly do electric car sales translate into cars on the road?
published 7 weeks ago
💌 How much deforestation is your country importing through trade?
published 5 weeks ago
💌 My book — Clearing the Air — is coming out in paperback in September
published 12 days ago
💌 Thailand’s population has already peaked
published 10 days ago
💌 Is Europe having a bad wildfire year?
published 18 hours ago