wunder beta🌡️ Climate Science
How the greenhouse effect works and why the planet is warming.
What you’ll learn
- Explain the greenhouse effect and the evidence that recent warming is human-caused.Greenhouse gases trap outgoing heat, keeping Earth habitable. CO2 has risen sharply since the industrial era, and isotopic, atmospheric, and temperature evidence together point to human activity as the cause of about 1.1-1.2 C of warming since the 1800s.
- Describe the main impacts of warming and the logic behind emissions targets.Warming melts ice and raises seas, intensifies many weather extremes, and triggers amplifying feedbacks. Because CO2 lingers for centuries, limiting warming depends on cumulative emissions, making net-zero the central goal alongside adaptation.
Questions this course answers
What does the natural greenhouse effect do?
Greenhouse gases absorb and re-emit outgoing infrared radiation, keeping the lower atmosphere warmer than it would otherwise be.
Roughly what is the current atmospheric CO2 concentration?
CO2 has risen above 420 parts per million, higher than at any point in at least two million years.
Which observation supports that recent warming is human-caused?
A cooling upper atmosphere with a warming surface is the fingerprint of heat trapped below, not of a brighter Sun.
What are the two main causes of rising sea levels?
Melting glaciers and ice sheets add water, and warming seawater expands, both raising sea levels.
Why can a warmer atmosphere produce heavier downpours?
Warmer air can hold more water vapor, so storms can release heavier rainfall.
Why does the concept of a 'carbon budget' matter?
Because CO2 persists for centuries, long-term warming tracks the total amount emitted, so stabilizing climate requires reaching net-zero emissions.
Grounded in trusted sources
- NOAA Climate.gov, 'Climate change: atmospheric carbon dioxide' (climate.gov)
- NOAA Climate.gov, 'Climate change: global temperature' (climate.gov)
- World Meteorological Organization, 'Carbon dioxide levels increase by record amount to new highs in 2024' (wmo.int)
- IPCC Sixth Assessment Report (2021-2023), Working Group I Summary for Policymakers
- NASA Global Climate Change, 'Evidence' (climate.nasa.gov)
Every Wunder lesson is built from real, reputable sources — never invented.
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