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+0.5°C

Warming above pre-industrial levels

The 1.5°C threshold

0ppm

CO₂ in the atmosphere

Highest in 3 million years

0 years

To cut emissions in half

To limit warming to 1.5°C

Why it matters

Earth's atmosphere is only about 12 km thick — less than 0.2% of the planet's radius. Every tonne of CO₂ we emit stays trapped inside that razor-thin shell. There is nowhere for the pollution to go.

Scale: Earth vs. Atmosphere

Earth's radius — 6,371 km

← Atmosphere: ~12 km

The Atmosphere Is
Razor Thin.

If Earth were the size of a basketball, the entire atmosphere — the only thing standing between life and the void of space — would be thinner than a coat of varnish. Every molecule of CO₂ we emit is trapped inside that vanishingly thin shell.

There is no "up there" for pollution to escape to. It stays. It accumulates. It warms.

12 km

Thickness of the breathable atmosphere

The troposphere where weather — and warming — happens

0.19%

Of Earth's radius

Less than the skin of an apple relative to the apple itself

421 ppm

CO₂ concentration today

Up from 280 ppm before industrialization — a 50% increase

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