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Learn Climate Science

Understand the physics and evidence behind a changing climate.

Free to start. Built from a single prompt. No credit card.

Climate science studies the long-term behavior of Earth's atmosphere, oceans, ice and living systems, and why it changes. Its foundation is an energy budget: sunlight comes in, infrared heat goes out, and greenhouse gases like carbon dioxide and methane slow that outgoing heat. On top of that come the carbon cycle, evidence from ice cores and thermometers, feedbacks and the computer models used for projections. Learnr builds a personalized climate science course from a single prompt and teaches the physics and evidence in short, interactive lessons.

How to learn Climate Science, step by step

Separate weather from climate. Weather is what happens this week; climate is the statistics of weather over decades, often summarized as 30-year averages. Practice reading anomaly graphs, which show departures from an average rather than raw temperatures.
Learn the radiation balance. Sunlight arrives mostly as visible light and Earth sheds heat as infrared. Learn why carbon dioxide, methane, water vapor and nitrous oxide absorb infrared while nitrogen and oxygen do not, and compare Venus, Earth and Mars.
Follow carbon through its reservoirs. Track carbon between air, oceans, plants, soils and rocks on fast and slow timescales. Read the Keeling curve, whose yearly zigzag comes from Northern Hemisphere plant growth, and learn how isotopes mark carbon from fossil fuels.
Read the evidence from the past. See how air bubbles in ice cores record ancient carbon dioxide and how oxygen isotopes, tree rings and sediments act as proxies for temperature. Learn how Milankovitch orbital cycles pace the ice ages.
Understand feedbacks and models. Learn the ice-albedo and water vapor feedbacks and the idea of climate sensitivity. Climate models divide the planet into grid cells and solve physical equations; compare emissions scenarios in an IPCC Summary for Policymakers.
Work with real data yourself. Download a public temperature or carbon dioxide record from NASA or NOAA, plot it in a spreadsheet and fit a trend line. Keep concepts fresh between data sessions with short daily Learnr lessons.

What you'll learn

Distinguish weather from climate and read a temperature anomaly graph
Explain Earth's energy balance and the greenhouse effect
Describe the carbon cycle and how burning fossil fuels changes it
Interpret evidence such as the Keeling curve, ice cores and tree rings
Explain climate feedbacks, climate sensitivity and how models make projections

What's inside your Climate Science course

A sample path Learnr builds for Climate Science. Your real course adapts to your goal and level.

1. Weather, climate and the energy budget
2. The greenhouse effect
3. The carbon cycle and greenhouse gases
4. Evidence from the past: ice cores and other proxies
5. Feedbacks, models and projections
6. Impacts, adaptation and mitigation

How long does it take to learn Climate Science?

The core concepts take about 4 to 8 weeks at 3 hours a week. Reading the primary assessment reports with confidence takes a few months, and quantitative climate modeling requires physics, calculus and programming, which is a much longer path.

What you need before you start

None for the basics. Some physics, like energy and radiation, and comfort reading graphs help, and a spreadsheet is enough for working with real climate data.

Common mistakes to avoid

Treating one cold winter or heat wave as proof either way. Climate is about long-term trends, so look at decades of data.
Confusing the ozone hole with the greenhouse effect. They are separate problems with different gases and different physics.
Learning from headlines instead of primary data and assessment reports, which present the evidence along with its uncertainty ranges.

How Learnr builds your course

Type your topic

Tell Learnr you want to learn Climate Science, or get as specific as you like.

Get a personalized course

Learnr instantly builds a full Climate Science course tailored to your goal and skill level.

Learn and level up

Move through bite-sized lessons and interactive practice, earning XP and keeping your streak.

Climate Science questions, answered

How do scientists know humans are causing the current warming?

Several independent lines of evidence agree: the physics of greenhouse gases, the measured rise in carbon dioxide, isotopes showing that carbon comes from fossil fuels, and patterns such as the upper atmosphere cooling while the lower atmosphere warms.

What is the difference between climate change and global warming?

Global warming refers to the rise in average surface temperature. Climate change is broader and includes shifts in rainfall, ice, sea level and extreme weather that come with it.

Do I need strong math to learn climate science?

Not for the concepts. Reading graphs and basic algebra are enough to start, while climate modeling and research require calculus, statistics and programming.