Mon Prof Augmenté
How the Greenhouse Effect Warms Cities
Age 15 · Geography
Sunlight passes through the atmosphere and warms the ground, which sends heat back up as invisible infrared rays. Greenhouse gases in the air bounce much of that heat back down, so the planet warms and crowded coastal cities face heat waves and rising seas.
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Age 15: open this week
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In the picture
- Sunlight: short-wave rays that pass through the atmosphere to the ground
- Heat rising from the warm ground as infrared radiation
- Greenhouse gas molecules: they absorb heat and send much of it back down
- A crowded coastal city: exposed to extreme heat and rising sea levels
Examples
- A car parked in the sun gets hot inside because heat gets in but cannot easily escape.
- Burning petrol, coal and gas adds extra carbon dioxide, and cities like Miami or Jakarta now flood more often.
Key takeaways
- Greenhouse gases like carbon dioxide and methane trap heat near Earth’s surface.
- Dense coastal cities face the double risk of heat waves and sea-level rise.
Quiz: How the Greenhouse Effect Warms Cities (Age 15)
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What do greenhouse gases like carbon dioxide and methane do?
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What happens to the heat that rises from the warm ground as infrared radiation?
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Which double risk do crowded coastal cities face as the climate changes?
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