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Climate Change Responses
IB DP ESS — Topic 6: Atmosphere and Climate Change | HL Extension | Paper 1 & Paper 2A/2B
🎯 Learning Intentions By the end of this note, you will be able to:
- Distinguish between mitigation and adaptation as two fundamentally different categories of climate change response, and explain why both are necessary.
- Evaluate the effectiveness of specific mitigation strategies — including renewable energy transitions, carbon capture and storage, and nature-based solutions — using ESS analysis parameters of scale, trade-offs, and sustainability.
- Explain how adaptation strategies function at local, national, and international scales, with reference to named real-world examples from both MEDCs and LEDCs.
- Analyse the role of international climate agreements (including the Paris Agreement and UNFCCC framework) in coordinating global responses to climate change, including their limitations.
- Discuss contrasting worldviews — ecocentric, technocentric, and anthropocentric — in relation to the choice and prioritisation of climate change responses.
- Evaluate the concept of carbon offsetting and carbon markets as economic instruments for emissions reduction, including their limitations and controversies.
- Discuss the equity dimensions of climate change responses, including the differential responsibilities of MEDCs and LEDCs and the concept of climate justice.
- Justify why no single response strategy is sufficient and why a portfolio approach integrating mitigation, adaptation, and systemic change is required.
Real-World Context & Relevance
In August 2023, the global average surface temperature exceeded 1.5°C above pre-industrial levels for the first time on record — a threshold that the 2015 Paris Agreement had identified as a critical guardrail for avoiding the most severe climate impacts (Copernicus Climate Change Service). That same summer, wildfires consumed over 900,000 hectares of land in Greece and Canada, while Pakistan — still recovering from catastrophic 2022 floods that submerged one-third of the country — faced renewed extreme heat events. These are not isolated incidents. They are the compounding consequences of a climate system that has already been fundamentally altered by over 200 years of fossil fuel combustion, deforestation, and industrial agriculture.
The question facing environmental scientists, policymakers, and societies is no longer simply whether climate change is occurring — the IPCC Sixth Assessment Report (2021–2022) confirmed with "unequivocal" certainty that human influence has warmed the atmosphere, ocean, and land — but rather how humanity should respond. The responses available span a vast spectrum: from engineering the atmosphere through solar geoengineering, to planting mangroves along coastlines, to redesigning urban infrastructure, to negotiating legally binding emissions targets between 196 nations. Each response carries different assumptions about the role of technology, the rights of future generations, and the responsibilities of wealthy versus developing nations. Understanding these responses — their mechanisms, effectiveness, trade-offs, and equity implications — is one of the most urgent analytical tasks in contemporary environmental science.
🌍 Why This Matters The IPCC AR6 Synthesis Report (2023) concluded that the window for limiting warming to 1.5°C is "rapidly closing" and that the next decade of decisions will determine whether climate change remains manageable or becomes catastrophic. The responses examined in this topic are not theoretical — they are being implemented, debated, and contested right now, and their outcomes will shape the stability of every environmental system on Earth.
Core Concepts & Definitions
When a system is being pushed toward a dangerous state, there are fundamentally two types of response available: you can try to stop the force pushing it (address the cause), or you can try to make the system more resilient to the push (manage the consequences). In climate science, these two approaches are formalised as mitigation and adaptation. Understanding the distinction between them — and why both are essential — is the conceptual foundation for everything else in this topic.
📖 Key Definition — Mitigation Climate change mitigation refers to actions that reduce or prevent the emission of greenhouse