IB ESS HL Topic 10 — Environmental Economics Paper 2 HL HL only ~11 min read

What Environmental Economics Is For

Economics is about how societies handle the fact that resources are limited and wants are not. Environmental economics asks the follow-up question: what happens when some of those limited resources are rivers, forests and a stable climate? You need the ordinary economics first, so that is where this starts.

📘 What you need to know

The economic problem

Every society faces the same basic difficulty: resources are scarce and wants are effectively unlimited. That forces choices, and economics is the study of how those choices get made — both by individuals deciding what to buy and by whole societies deciding what to build. Three questions sit underneath it, and how a country answers them determines its economic system.

THE THREE QUESTIONS EVERY ECONOMY ANSWERS How a country answers them is what makes its economic system 1. WHAT GETS PRODUCED? 2. HOW IS IT PRODUCED? 3. WHO GETS WHAT IS PRODUCED? RESOURCES land, water, energy, labour PRODUCERS firms and factories HOUSEHOLDS people who consume allocation of resources distribution of output Notice where the environment sits: it is the first box, treated as an input. Environmental economics argues that treating nature as a free input is the problem.
Standard economics starts with resources and ends with consumption. Nothing in the diagram sends anything back, which is the same criticism the circular economy makes in 7.3.

Supply, demand and price

The interaction of the two determines the equilibrium price and quantity in a market. If the price of smartphones falls, demand may rise because more people can afford one. If the price rises, producers are willing to supply more but fewer consumers will buy. The price settles where the two lines meet.

WHERE A MARKET PRICE COMES FROM The price settles where what buyers will pay meets what sellers will accept Price SUPPLY DEMAND EQUILIBRIUM P* Q* Quantity Supply slopes up, demand slopes down, and the price is where they cross. If pollution costs nothing, that cost never appears in the price at all.
Learn the shape and the vocabulary. Later pages in this topic are about what this graph leaves out.

Market interaction

A market is any location or platform — physical or online — where buyers and sellers come together to exchange goods and services. Market interaction is simply that exchange happening under the forces of supply and demand. In a farmers’ market, farmers supply fresh produce and consumers demand fruit and vegetables; the price settles at the balance between what farmers will sell for and what consumers will pay.

MarketWhat is suppliedWhat determines the price
HousingHouses for saleSupply of houses against demand from buyers
LabourWorkersSupply of workers against demand from employers, setting wages
StockShares in companiesSupply of shares against demand from investors
AgriculturalAgricultural productsSupply of produce against demand from consumers
Foreign exchangeCurrenciesSupply of and demand for different currencies
The list matters less than the pattern. Every one of these works the same way: a price emerging from supply meeting demand. Once you see that, the interesting question becomes what happens to things that have no market at all — clean air, a stable climate, a species.

What environmental economics adds

Definition Environmental economics = the branch of economics that applies economic principles to environmental issues and the management of natural resources

It aims to understand how human activities affect the environment, and how economic policies can be designed to produce sustainable outcomes. Take the market for renewable energy: as demand for clean energy rises because of climate concern, environmental economics analyses which incentives and policies are needed to speed up the development and adoption of renewable technologies. That is the same subsidy-and-tax toolkit you met at the end of Topic 9, now with the reasoning behind it.

🤔 Why ordinary markets get the environment wrong

A market price reflects what buyers pay and what sellers charge. If a factory can release smoke into the air without paying anything for it, that smoke never enters the price of the product. The people downwind bear the cost in worse health, but they were not part of the transaction. So the market works perfectly by its own logic and produces too much of the polluting good anyway. This is the whole reason environmental economics exists: not because markets are broken, but because they are only counting the costs that someone remembered to charge for.

Two ways of seeing the solution

ESS frames this as a disagreement between technocentrics and ecocentrics, and it is really a disagreement about whether the economic system itself is the problem.

TECHNOCENTRIC

  • Science and technology can solve environmental problems within the existing economic framework
  • Emphasises innovation in developing modern technologies to address environmental challenges
  • Example: investment in carbon capture and storage to reduce emissions from power generation and manufacturing
  • Policy style: subsidies for electric vehicles and renewable energy projects to drive innovation

ECOCENTRIC

  • Takes a holistic approach prioritising fundamental changes in human behaviour
  • Does not believe environmental problems can be solved within the existing economic framework
  • Emphasises living in harmony with nature rather than relying on technological fixes
  • Example: promoting sustainable lifestyles such as minimalism and zero-waste living to cut consumption
THE ENVIRONMENTAL VALUE SYSTEM SPECTRUM ECOCENTRISM (nature-centred) nature has inherent value self-imposed restraint less materialistic living biorights and education harmony with nature ANTHROPOCENTRISM (people-centred) humans manage systems taxes and legislation everyone participates growth if managed well biodiversity has value TECHNOCENTRISM (technology-centred) technology solves it understand and control science informs policy sustain the global market continued economic growth These are ends of a spectrum, not three boxes people sit neatly inside. Most real policies borrow from more than one position at the same time.
You met these positions in Topic 1. Here they reappear as an argument about whether economic growth and environmental protection can coexist.

Perspectives on solutions

The existing economic system tends to assume that scientific and technological advances will be enough to meet environmental challenges. That shows up in policies focused on developing modern technologies to reduce environmental impacts — government subsidies for electric vehicles and renewable energy projects, designed to drive innovation and cut dependence on fossil fuels.

Supporters of environmental economics argue instead for a shift towards sustainable and responsible human behaviour. That shows up in policies that prioritise environmental protection and social well-being over economic growth — for example regulations restricting harmful activities, such as vehicle emissions standards intended to cut air pollution and improve public health.

Neither position is the “right answer”. An exam question asking you to compare them wants you to see the trade-off: technology can act fast without asking anyone to change their life, but it treats the symptom. Behaviour change addresses the cause, but is far harder to make happen at scale.
EXAM-STYLE

Define environmental economics and outline its purpose. [3]

Point 1 — definition Environmental economics is a branch of economics that applies economic principles to environmental issues and the management of natural resources. Point 2 — purpose It aims to understand how human activities impact the environment, and how economic policies can be designed to achieve sustainable outcomes. Point 3 — example In the renewable energy market, it analyses which incentives and policies are needed to promote the development and adoption of renewable technologies as demand for clean energy rises. 3 marks: definition, purpose, applied example The phrase “economic principles applied to environmental issues” is the one the mark scheme is looking for.
EXAM-STYLE

Compare technocentric and ecocentric approaches to solving environmental problems. [4]

Technocentric Believes science and technology can solve environmental problems within the existing economic framework, emphasising innovation. For example, investing in carbon capture and storage to cut emissions from power generation. Ecocentric Takes a holistic view and does not accept that problems can be solved within the existing framework. It prioritises fundamental changes in behaviour and living in harmony with nature, for example promoting minimalism and zero-waste living. The key difference Technocentrics keep the economic system and change the technology; ecocentrics argue the system itself must be challenged or transformed. A similarity worth noting Both aim to reduce environmental damage; they disagree about the route, not the goal. 4 marks: both positions with examples, the difference, and a point of similarity “Compare” invites similarities as well as differences. That last line often secures the top mark.

💡 Exam tip

⚠ Common mix-up

That completes 10.1. Read it alongside Combining Legal and Economic Tools in 9.3 — the subsidies, taxes and incentives there are exactly the policy instruments this page gives you the reasoning for.

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