Clean air is not bans — it is moving the source
Cities rarely "destroy" pollution — they move it in time and space. What an improving statistic really means, and where the exported emission hides.
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Reports & explainers
Long reads on climate, energy, cities and the ocean: methodology, interactive graphics and takeaways you can verify.
How to lie with a chart without lying with a single number
A truncated axis, a dual scale and a cherry-picked interval — three tricks that turn honest data into a dishonest conclusion. Demonstrated on the very same numbers.
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How a triangle becomes a column: demography in four charts
The age pyramid is the most honest portrait of a society. We unpack why it changes shape, what the demographic transition is, and why population growth does not switch off at once.
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The air quality index hides more than it shows
A single AQI number is handy for a traffic light on your phone, but it conceals what air you actually breathe. We unpack PM2.5, the split of days by category and the daily NO₂ rhythm.
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Sea level rises slowly — which is exactly why it is underestimated
Three millimetres a year sounds trivial until you see what stands behind it: the thermal expansion of water and the ocean's accumulated heat content, which has no stop button.
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A city changes transport where it changes habits, not where it builds roads
The modal split of trips shifts slowly and predictably. We look at how the structure of movement changed over fourteen years, and why a congestion heatmap beats an average speed.
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The energy transition is measured by when power is missing, not by capacity
Solar and wind have become cheap, but installed-capacity statistics mislead. Here is why the transition is decided at the evening peak, and what the daily load curve reveals.
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Why climate scientists talk about anomalies, not degrees
The planet's average temperature is almost useless on its own. Here is why science measures departures from a baseline, what the CO₂ curve actually shows, and how to read warming stripes.
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