wunder beta🌡️ Climate Change
How greenhouse gases warm the planet, and what the science really shows.
What you’ll learn
- Explain the greenhouse effect, the main greenhouse gases, and the evidence for rising CO2.The greenhouse effect keeps Earth warm, but human emissions of CO2, methane, and other gases are intensifying it. CO2 has risen from about 280 to 419 ppm, and multiple independent lines of evidence confirm human-caused warming.
- Describe how warming affects temperature, ice, sea level, weather, and nature.Global temperature has risen about 1.1 degrees Celsius, melting ice and raising seas. A warmer atmosphere intensifies extreme weather and stresses ecosystems, from coral reefs to migrating species.
- Compare mitigation and adaptation and explain the need for global cooperation.Cutting emissions (mitigation) and preparing for unavoidable change (adaptation) are both essential. The Paris Agreement sets shared global goals, and future warming depends on the choices made now.
Questions this course answers
What does the greenhouse effect do?
Greenhouse gases absorb and re-radiate outgoing infrared heat, keeping Earth warmer than it would otherwise be.
Which gas is the largest contributor to human-caused warming?
Carbon dioxide, mainly from burning fossil fuels, accounts for the largest share of warming since pre-industrial times.
Roughly what was the atmospheric CO2 level before the Industrial Revolution?
Pre-industrial CO2 was around 280 ppm; by 2023 the global average had risen to roughly 419 ppm.
About how much had global surface temperature risen by 2011 to 2020 versus 1850 to 1900?
The IPCC reported roughly 1.1 degrees Celsius of warming above the 1850 to 1900 baseline.
Why are sea levels rising?
Melting land ice adds water to the oceans, and seawater expands as it warms, both raising sea levels.
How does a warmer atmosphere affect extreme weather?
A warmer atmosphere holds more moisture and energy, intensifying heatwaves, heavy downpours, and some storms.
Grounded in trusted sources
- IPCC, AR6 Synthesis Report: Climate Change 2023 (ipcc.ch/report/ar6/syr/)
- NOAA Climate.gov, Climate Change: Atmospheric Carbon Dioxide (climate.gov)
- NASA, Global Climate Change: Vital Signs of the Planet (climate.nasa.gov)
- World Resources Institute, Top Findings from the IPCC 2023 Report (wri.org)
- United Nations, The Paris Agreement (unfccc.int)
Every Wunder lesson is built from real, reputable sources — never invented.
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