🎯 By the end of this lesson you will…
🔬 What the Science Says — No Ambiguity
Let's be precise. The scientific consensus on climate change is not an opinion. It is one of the most thoroughly examined conclusions in the history of science:
The Earth has warmed by approximately 1.1°C since pre-industrial times. 97% of actively publishing climate scientists agree this warming is primarily caused by human greenhouse gas emissions (Cook et al., 2013 — the most cited study on the topic, confirmed by multiple subsequent analyses). The remaining 3% is not a coherent alternative theory — it is a collection of different, contradictory objections.
Carbon dioxide and other greenhouse gases trap heat in the atmosphere. This is not a modern discovery — Eunice Newton Foote demonstrated it in 1856, and Swedish scientist Svante Arrhenius calculated in 1896 that doubling CO₂ would raise global temperatures by 5–6°C. The mechanism has been understood for over 150 years. The physics is the same physics used in your fridge and your microwave.
Small numbers mask large consequences. During the last Ice Age, the Earth was only 4–5°C colder than today — enough to bury Britain under a kilometre of ice. The difference between a stable, habitable Earth and a catastrophically different one is measured in single digits. We have already moved 1.1°C and are on track for 2.5–3°C by 2100 under current policies.
🧠 The Psychology of Denial
If the science is so clear, why do so many people doubt or dismiss it? This is a genuine and important question — and the answer is psychology, not stupidity.
People are more likely to reject evidence that threatens their existing lifestyle, identity or economic interests. A person whose livelihood depends on fossil fuels, or whose identity is tied to a political group that dismisses climate change, faces a much higher psychological cost to accepting the evidence. This is not dishonesty — it is how human cognition works, and it affects everyone.
This is not just psychology — it is also deliberate strategy. Internal documents from major oil companies including ExxonMobil show they had accurate climate science internally from the late 1970s. They then spent decades funding organisations designed to manufacture public doubt about that same science. A 2017 Harvard study confirmed Exxon's internal and external communications were systematically different on climate science.
Common objections include: "climate has always changed naturally" (true — but the current rate of change is 10× faster than any natural shift in the geological record), "it's the Sun" (solar output has been flat or declining since the 1980s while temperatures rose), "CO₂ is plant food" (true at low levels — at high levels it disrupts the entire ecosystem balance). Each objection has been tested and refuted.
💥 Activity — Myth Busters
Click each myth to reveal the scientific reality. Then write in your own words why the myth is wrong — use the vocabulary from this lesson.
❓ Quick Check
Portfolio — Misconception Correction Card
A myth you used to believe — now corrected with evidence.
Glossary — Lesson 1
🎯 By the end of this lesson you will…
⛽ Beyond the Petrol Station
When people talk about ending fossil fuels, they often picture cars and power stations. The reality is far more embedded in daily life:
The Haber-Bosch process synthesises ammonia from nitrogen and hydrogen using natural gas. This ammonia becomes fertiliser. Without it, roughly half the world's population could not be fed. The nitrogen in the proteins your body is built from almost certainly passed through a natural gas plant. Food production accounts for about 10% of UK greenhouse gas emissions, and fossil fuels are embedded throughout it.
Virtually every plastic product — including medical equipment, syringes, IV bags, surgical gloves and drug capsules — is derived from petroleum. There is no viable large-scale alternative for many of these applications. The plastics in your smartphone, your school bag, your water bottle, and your NHS hospital are all fossil fuel products.
Hard-to-abate sectors are industries where decarbonisation is genuinely technically difficult. Steel production requires coking coal to reduce iron ore — electric alternatives exist but are expensive and early-stage. Cement production releases CO₂ as a chemical byproduct of the reaction, not just from the energy used — you cannot decarbonise it simply by switching to renewable electricity. Aviation fuel has no viable replacement at scale.
Global energy consumption is approximately 580 exajoules per year — an almost incomprehensible number. 80% of this comes from fossil fuels. Replacing this with renewables would require building the equivalent of the world's entire current energy infrastructure in under 30 years, while also growing total energy supply to meet rising demand from developing nations. This is not impossible — but it is genuinely, technically enormous.
📍 Activity — Your Fossil Fuel Day
Click each moment in a typical school day to discover the hidden fossil fuel dependency. How surprised are you by what you find?
❓ Quick Check
Portfolio — Your Fossil Fuel Day Map
Trace fossil fuel use through your actual day. Be honest and specific.
Glossary — Lesson 2
🎯 By the end of this lesson you will…
📉 The Good News First — Costs Have Collapsed
The case for pessimism about clean energy is weaker than it was a decade ago. Solar power costs have fallen by 90% since 2010. Wind power costs have halved. In 2023, for the first time, more new electricity generation capacity was added from renewables than all fossil fuels combined globally. This is genuinely historic.
In 2000, renewable energy was less than 1% of global electricity. By 2023 it was over 30%. Solar alone could produce more electricity than the entire world currently uses within 12 years at current growth rates, according to some analysts. The trajectory is real — the question is whether it is fast enough.
⚡ The Storage Problem — The Critical Bottleneck
Renewable energy has one fundamental problem: the sun doesn't always shine and the wind doesn't always blow. A grid powered entirely by renewables needs storage — vast quantities of it — to cover nights, calm days, and seasonal variation.
The UK currently uses about 300 terawatt-hours of electricity per year. The entire world's installed battery storage capacity in 2023 was approximately 50 gigawatt-hours — roughly 0.017% of UK annual electricity demand. Batteries would need to scale by a factor of thousands to back up a fully renewable grid. This is physically and economically achievable — but it is the central engineering challenge of the energy transition.
Pumped hydro (pumping water uphill when energy is cheap, releasing it through turbines when needed) already provides 90% of global grid storage. Hydrogen (using surplus electricity to split water, storing the hydrogen, burning it later) is promising but inefficient. Flow batteries, compressed air, gravity-based systems — all are under development. The solution will likely be a mix.
⚡ Activity — Technology Evaluator
Click each technology to see an honest assessment of its pros, cons, and current status. Then decide: which combination would you invest in?
⚛️ Discussion — The Nuclear Debate
Nuclear power is one of the most divisive issues in energy policy. Both sides have serious arguments. Read the evidence and decide where you stand.
✅ Case FOR nuclear
⚠️ Case AGAINST nuclear
Portfolio — Technology Evaluation Brief
Choose ONE technology. Research it and make an honest case.
Glossary — Lesson 3
🎯 By the end of this lesson you will…
📜 The Historical Responsibility Problem
CO₂ accumulates in the atmosphere over decades and centuries. Who is responsible for the CO₂ already up there?
The United States has emitted approximately 25% of all cumulative CO₂ since industrialisation. The EU collectively around 22%. China — now the world's largest annual emitter — has contributed around 13% cumulatively because its industrialisation came later. The entire African continent, home to 1.4 billion people, has contributed less than 4%. The people least responsible for creating the problem are often those most vulnerable to its consequences.
India, Nigeria, Bangladesh and dozens of other countries are in the middle of the same development process that made Europe and America wealthy — a process that has historically required cheap fossil fuel energy. When wealthy nations say "you must use expensive renewables instead," they are, in effect, saying "you must develop more slowly and expensively than we did." This is a genuine tension, not a simple propaganda point.
At the Copenhagen climate conference in 2009, wealthy nations promised to deliver $100 billion per year by 2020 to help developing countries address climate change. That target was not met until 2022 — two years late — and even then the accounting was disputed, with loans counted as grants. At COP28 in 2023, a Loss and Damage fund was finally established — but initial pledges totalled only around $700 million against estimated needs of hundreds of billions annually.
🌊 Loss and Damage — The New Frontier
Loss and Damage refers to the harms from climate change that cannot be adapted to — homes already lost to sea level rise, species already extinct, cultures already displaced. It is distinct from mitigation (preventing emissions) and adaptation (adjusting to changes).
Pakistan (2022): Unprecedented flooding — worsened significantly by climate change according to attribution science — submerged one-third of the country, killed 1,700 people, and caused $30 billion in damage. Pakistan contributes less than 1% of global emissions. Tuvalu: A Pacific island nation that may cease to exist as a physical landmass due to sea level rise. Its 11,000 citizens have signed agreements with Australia for citizenship rights — the world's first climate-driven national evacuation plan.
📅 Key Moments in the Global Climate Justice Debate
💬 Where Do You Stand?
Glossary — Lesson 4
🎯 By the end of this lesson you will…
💰 What the Research Says Actually Works
The British Columbia carbon tax, introduced in 2008, reduced fuel consumption by 15–17% relative to the rest of Canada, with no significant economic harm. Sweden's carbon tax — introduced in 1991 at about £25/tonne, now approximately £120/tonne — coincided with a 26% reduction in transport emissions. The economic consensus is that carbon pricing is the most cost-effective lever available. Its political unpopularity is the main obstacle.
The EU's ban on incandescent light bulbs saved approximately 39 million tonnes of CO₂ annually. Vehicle fuel efficiency standards in the US, EU and China have prevented billions of tonnes of emissions. Regulations succeed where voluntary action fails because they remove the competitive disadvantage of acting alone — every producer is subject to the same rule.
Climate litigation is exploding. In 2021, a Dutch court ordered Shell to cut emissions by 45% by 2030. In 2023, a Montana court ruled the state violated its constitution by promoting fossil fuels without considering climate impacts. There are now over 2,000 climate-related lawsuits globally, with a growing success rate. Litigation is changing corporate behaviour where lobbying has failed.
Research by Kimberly Nicholas (2018) found the highest-impact individual actions are: having one fewer child (saves 58 tonnes CO₂/year), living car-free (2.4 tonnes), taking one fewer transatlantic flight (1.6 tonnes), eating plant-based diet (0.8 tonnes). In contrast, recycling saves about 0.2 tonnes. The gap between what people think helps and what actually helps is large. But individual action also has political and social multiplier effects.
The concept of an individual "carbon footprint" was popularised by a BP advertising campaign in 2004. This is not a conspiracy theory — it is documented history. Shifting moral responsibility from producers to consumers is a deliberate strategy. 100 companies are responsible for 71% of global emissions (CDP 2017). This does not mean individuals have no responsibility — it means the framing matters.
🔀 Activity — Rank the Interventions
Drag these climate interventions from 1 = least impactful to 8 = most impactful based on what you think the evidence shows. Then compare with a partner.
Portfolio — Evidence-Ranked Action Plan
What would YOU actually do — as an individual, as a voter, as a future citizen?
Glossary — Lesson 5
🎯 By the end of this lesson you will…
💬 Choose Your Central Claim
A good position paper argues a specific, falsifiable claim — not just "climate change is bad." Here are some strong position options. You don't have to choose one of these, but your claim should be this specific:
"The pace of the clean energy transition is dangerously slow, and governments must implement carbon pricing now, even at short-term economic cost, because the cost of inaction will be vastly higher."
"The global climate response is fundamentally unjust, and no meaningful progress is possible without wealthy nations first fulfilling their financial obligations to the countries they have harmed."
"Climate change will be solved primarily through technological innovation, not political agreements, and the best investment governments can make is in clean technology research and development."
Write your own specific claim, drawing on the evidence from this unit. It must be more specific than "we need to do more."
Final Research Task — One New Piece of Evidence
Before writing your position paper, find one piece of evidence we haven't covered in this unit. Use a reliable source: Carbon Brief, Climate Home News, IPCC reports, Nature, The Guardian Science, BBC Science.
Peer Review Checklist
Swap with a partner. Tick what you can see in their position paper.
Glossary — Lesson 6
Unit Complete
You've engaged with the hardest problem in the world as it deserves — seriously, honestly, with the complexity intact. Whatever you conclude, the rigour of your thinking is what matters.