Climate and Energy: Reading the Science Clearly

What's inside

1. Level 1: Joules, Watts and the Kettle on Your StoveFree
   Energy is a quantity you spend, and power is how fast you spend it; learning to tell them apart turns the gigawatts and terawatt-hours in headlines into things you can picture, like a kettle, a home and a country.
2. Level 2: The Blanket of Air: The Greenhouse EffectFree
   Sunlight comes in, the warmed Earth glows back in infrared, and certain gases catch part of that glow, which keeps the planet habitable and makes it warmer as those gases build up.
3. Level 3: Tipping the Scales: Radiative Forcing
   Radiative forcing measures, in watts per square metre, how far a change such as extra carbon dioxide, methane, aerosols or a brighter sun pushes the planet's energy budget out of balance.
4. Level 4: Carbon's Long Journey: Air, Sea, Land and Rock
   Carbon moves between the atmosphere, oceans, plants, soils and rocks on timescales running from a single season to millions of years, and burning fossil fuels moves carbon from slow stores into fast ones far quicker than nature takes it back.
5. Level 5: Taking the Planet's Temperature
   Weather stations, ships, ocean floats and satellites are stitched into global temperature records, and scientists correct them for changes in instruments and surroundings before reading a single trend from them.
6. Level 6: Counting the Carbon in the Air
   From the continuous record begun on Mauna Loa in 1958 to today's global network, direct measurements show CO2 rising year by year, and the chemical fingerprints of that carbon show it comes from fossil fuels.
7. Level 7: Messages in the Ice
   Air bubbles and layers of ice drilled from Antarctica and Greenland keep a record of past atmospheres and temperatures going back about 800,000 years, through ice-age cycles and the slow swings that drove them.
8. Level 8: Whodunit: Separating Natural from Human
   Detection and attribution science weighs the sun, volcanoes, ocean cycles like El Niño and human emissions against the patterns each would leave, then asks how much a particular heatwave or downpour was made more likely or more intense.
9. Level 9: Worlds in a Computer: Climate Models
   Climate models divide the planet into a grid and solve the physics of air, ocean, ice and land step by step; they are strong on broad trends and physical consistency and weaker at fine local detail and some processes such as clouds.
10. Level 10: How Sensitive Is the Planet?
    Climate sensitivity asks how much the world eventually warms if CO2 doubles, and the IPCC's Sixth Assessment combined several lines of evidence to give a best estimate of 3°C within a likely range of 2.5 to 4°C.
11. Level 11: Changes Seen and Changes Ahead
    Warming already shows up in heat extremes, retreating ice, rising seas and shifting rainfall, and the IPCC's scenarios show how much further those changes go depending on the emissions path humanity chooses.
12. Level 12: Tipping Points, Stated Carefully
    Some parts of the climate system, such as ice sheets, the Atlantic overturning circulation and the Amazon rainforest, could shift abruptly or irreversibly, but thresholds and timings are often deeply uncertain and need careful wording.
13. Level 13: Ancient Sunlight: Coal, Oil and Gas
    Fossil fuels store energy captured by plants long ago, and their density, convenience and existing infrastructure explain their dominance as clearly as their emissions and air pollution explain the case against them.
14. Level 14: Steady Power: Nuclear and Hydro
    Nuclear and hydropower supply low-carbon electricity that runs on demand, each with its own trade-offs of cost, build time, waste, safety perceptions, land and ecosystems.
15. Level 15: Catching the Wind and the Sun
    Wind turbines and solar panels have become some of the cheapest sources of new electricity in many places, yet their output follows the weather, and how much they deliver depends on capacity factor, not just nameplate size.
16. Level 16: Keeping the Lights On: Grid and Storage
    A power grid must match supply and demand second by second, so variable wind and solar call for transmission lines, flexible plants and storage ranging from batteries that cover hours to options that could cover seasons.
17. Level 17: Electrifying Demand: Heat Pumps and EVs
    Heat pumps move heat instead of making it, and electric vehicles waste far less energy than engines, so electrifying homes and transport can cut energy use while adding new loads that a smarter grid can shift in time.
18. Level 18: Hydrogen: Where It Fits and Where It Doesn't
    Hydrogen can carry energy and feed industry, but making, storing and converting it loses a large share of the energy, so its strongest uses are probably narrow ones such as steel, fertiliser and some heavy transport.
19. Level 19: Pulling Carbon Back: Capture and Removal
    Capturing CO2 at a smokestack prevents new emissions, while removing CO2 already in the air through forests, soils, direct air capture or other methods takes it back, and each must be judged on permanence, cost and realistic scale.
20. Level 20: Fields, Forests and the Dinner Plate
    Farming, deforestation and diets produce a substantial share of greenhouse emissions, mainly through methane, nitrous oxide and cleared land, while forests and soils act as carbon sinks that can grow or shrink with how land is used.
21. Level 21: Reading a Claim: Source, Numbers, Baseline, Gaps
    A headline lands on your screen, and you learn to slow it down: who said it and why, whether its numbers carry units and context, what year or quantity it compares against, and what it quietly leaves out.
22. Level 22: Final Challenge: The Whole Picture Exam
    The course comes together in one story, from sunlight and forcing through the evidence, the models and the impacts to the energy system and carbon removal, and you test it on realistic headlines that need every tool you have learned.

Access

The first 2 levels are free with a free account. Every level, the podcast edition and the AI tutor come with All Access at £4.99/month or any Creator plan — see pricing.

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