No Planet B. The future is ours to write. Now.
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That sounds small. So why is it a problem?
Want to test your climate decisions while playing? Try our Eco-Town mini-game.
🎮 Try the gameWhat is climate change?
The Sun warms the Earth. Some of that heat then escapes back into space. Greenhouse gases in the atmosphere trap part of it — a bit like the glass of a greenhouse.
The more of these gases there are (CO2, methane...), the warmer the Earth gets. That's the greenhouse effect.
The car in the sun
A closed car left in the sun, even in winter, becomes stifling within minutes — light passes through the windows, heats the interior, and that heat struggles to escape. This is exactly the greenhouse effect mechanism, at the scale of an entire planet.
Venus, Mars, Earth: proof from the planets
Venus has an atmosphere that's 96% CO2 and a surface temperature of about 464°C — hotter than Mercury, despite being much farther from the Sun. Mars, with a very thin atmosphere, is freezing cold. Same amount of sunlight reaching the surface, radically different result depending on atmospheric thickness and CO2 content.
The greenhouse effect is essential to life on Earth. The problem isn't that it exists — it's that human activity is strengthening it very fast, over decades rather than millennia.
Two countries, seven realities
Pick two countries and compare them, theme by theme.
Rank from most to least polluting
Click the items in order, from most polluting to least polluting.
What we gain
The ecological transition isn't just about what we give up.
- Less air pollution, so fewer respiratory problems
- Better-insulated homes, more comfortable and cheaper to heat
- Less dependence on energy imports
- Greener cities, more pleasant to live in
Warming across generations
This chart shows the global warming already measured since 1900, then the possible scenarios depending on today's collective choices. Pick a birth year below to see how much warming that generation could face at different ages.
👆 Click a scenario above to see its impact on nature and biodiversity.
Choose a birth year
2015
At birth (2015)
+1,1 °C
At age 30 (2045)
+1,6 °C – +2,2 °C
depending on collective choices
At age 50 (2065)
+1,5 °C – +3,2 °C
depending on collective choices
At age 70 (2085)
+1,4 °C – +4,2 °C
depending on collective choices
Source: NASA GISS (1900-2024 historical) and IPCC AR6 Working Group I, Table SPM.1 (2020-2100 scenarios). Original visualization by this site — not a reproduction of IPCC's own charts.
You don't need to be perfect.
Start with what's possible for you.
What would you like to focus on first?
The ecological transition isn't just what we give up. It's also the world we can build.
Want to go further?
Want to go further?