For two centuries, getting richer meant emitting more — the two lines climbed together. This chart follows seven economies from 1990 to 2022 to ask whether that link has finally bent. For four of them, it has.
Plot a country's wealth against its carbon and you get a path, not a point. Each year is a dot; join them and you can watch three decades of an economy move. The x-axis here is GDP per capita on a log scale — how rich the average person is — and the y-axis is CO₂ emitted per person. The old rule says the path should run up and to the right: richer and dirtier. What you're looking for is a line that turns — one that keeps moving right while bending down. That shape is decoupling: growth without the carbon.
Four of the seven did it. The United Kingdom is the clearest case: GDP per head rose 46% while CO₂ per person fell 57% — roughly halved — as coal left the power grid. France (−36%), the United States (−27%, on cheap gas displacing coal) and Germany (−40%) all made the same turn, growing richer while the average resident's emissions dropped. On the chart their lines share a family resemblance: they climb through the 1990s, then hook down and to the right after about 2005.
The counter-examples run the other way. China is the century's biggest transformation and its biggest emissions story at once: GDP per person grew more than sixfold, and CO₂ per person rose +282% — its line shoots up and to the right across the whole frame. India (+197%) and South Korea (+106%) are still on the up-and-right leg too, where every rich country once was. Decoupling, in other words, is real — but so far it is a rich-world achievement, reached only after a long climb.
A connected scatter is the right tool when time is the hidden third variable: you care less about where a country is than about the shape of how it got there. GDP sits on a log axis because incomes span from about $2,000 to $57,000 a head — linear, the poor countries would pile up against the left edge. Hollow dots mark 1990, arrowheads mark 2022, so direction is unmistakable, and a marker every decade gives the eye a sense of pace. Colour does one job: the four decoupled economies are cool, the three still climbing are warm, so the headline reads before you've parsed a single label. Each country's name sits at the end of its line with a knockout halo, placed by a solver that keeps it clear of every stroke — including its own.
The honest catch is baked into the footnote: these are production-based emissions — counted where goods are made, not where they're consumed. A country that closes a steel mill and imports the steel books a fall in emissions even if its shopping habits didn't change. So the rich world's decoupling shown here is a lower bound on its true carbon footprint; measured by consumption, the bends would be gentler. Two data notes fell out of the build, too. The GDP series (the Maddison Project) ends in 2022, which sets the chart's horizon — pairing it against later CO₂ figures would draw lines the wealth data can't support. And an early pass showed several countries starting at "$0" per capita: empty cells in the source file were being read as zero rather than missing, a reminder that a blank is not a nought.
One row per entity per year: an x value, a y value, and the year that orders them. The chart builds each path, places the end labels and computes the start-to-end change.
| country | year | gdp_per_capita | co2_per_capita |
|---|---|---|---|
| United Kingdom | 1990 | 26246 | 10.49 |
| United Kingdom | 2022 | 38358 | 4.56 |
| China | 2022 | 18921 | 8.22 |
Novice tip: keep both axes as raw quantities, not index numbers — the story here is the level of emissions, and a "1990 = 100" index would hide that China now out-emits France per person. Give every point a year even if the series has gaps; the chart sorts by it, so an out-of-order or missing year is the one thing that will visibly kink a line.
The line that bends is the good news of climate economics: growth and carbon can come apart, and in four large economies they already have. The line that climbs is the scale of what's left: the countries where most people still live are, understandably, on the leg the rich world spent a century on. Both truths sit in the same frame — which is exactly what a connected scatter is for.
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