Decarbonization Around the World
Decarbonization is the process of reducing how much CO₂ an economy emits per dollar of output. Because global energy use keeps climbing, any reduction in emissions, up to and including a path to net zero, requires rates of decarbonization to exceed rates of economic growth: it's the basic math of every climate mitigation policy, whatever shape the policy takes. This page tracks how fast decarbonization has actually proceeded around the world, historically, and lets you calculate the rate a given emissions-reduction target would require going forward. Emissions here mean CO₂ from fossil fuel combustion specifically — not methane, land use, or other greenhouse gases. The methodology here follows that first described in Roger Pielke Jr.'s book The Climate Fix.
CO₂ Intensity of GDP
CO₂ emissions per dollar of GDP, by country and region, 1965–2025 — the rate at which economies are decoupling growth from carbon. Toggle between market-exchange-rate and purchasing-power-parity GDP.
Source: Energy Institute Statistical Review of World Energy; World Bank.
Annualized rate of decarbonization
Compound annual rate of change in CO₂ intensity of GDP over the selected year range — negative means the economy decarbonized (intensity fell) over the period; positive means intensity rose. The period shown may be narrower than the selected range if an entity's data doesn't cover the full window (e.g. PPP GDP starts in 1990 for most countries).
Decarbonization Calculator
A Kaya-identity calculator: given a per-capita emissions reduction target and an assumed rate of per-capita energy consumption growth, what annual rate of decline in the carbon intensity of energy (CO₂ per unit of energy) would that target require — and how does that compare to the rate actually observed since 2015 and since 2000?
| Scenario | Period | Annualized rate |
|---|
Physical buildout to hit the target
| Fuel retired (priority order) | Exajoules/yr | % of baseline supply |
|---|
New capacity needed, if built exclusively as one type or the other:
| New capacity | Total by target year | Per week |
|---|
Illustrative, not an engineering plan. Retires coal before gas before petroleum, using standard CO₂ intensities (coal 94.6, gas 56.1, petroleum 73.3 kg CO₂/GJ — IPCC 2006 defaults) and standard plant assumptions: nuclear, 1 GW capacity at 90% capacity factor; wind, a 3 MW turbine at 35% capacity factor; a retiring coal plant, 600 MW at 55% capacity factor; a retiring gas plant, 500 MW at 50% capacity factor (the share image below expresses retired coal and gas the same way it expresses new nuclear and wind — as a plant count, not just raw energy). It also treats every unit of retired fossil energy as if it were generating electricity that a nuclear plant or wind turbine could directly replace — in reality, much of it isn't: fuel burned directly in vehicle engines, home furnaces, and industrial processes has no such direct substitute without first electrifying that end use. The fossil-retirement table above depends only on the target and today's baseline; the new-capacity tiles also grow or shrink with the assumed energy-growth rate above, since growing demand has to be met by new clean capacity too, on top of whatever replaces retired fossil fuel. So the buildout figures above are a rough estimate of what's needed, not a literal one-for-one replacement plan, but a sense of the scale of the challenge.
Share this result
Source: Energy Institute Statistical Review of World Energy; World Bank.