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NotesESS HLTopic 7.1Natural capital
Back to ESS HL Topics
7.1.25 min read

Natural capital (ESS HL)

IB Environmental Systems and Societies • Unit 7

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Contents

  • Natural capital at Higher Level
  • Natural capital: the stock
  • Three types of natural capital
  • Capital or income?
  • Exam-style question
Natural capital at Higher Level: The same statement as SL, with different real cases: the Ogallala Aquifer, Norway's cod, rivers and oil, the Amazon and the Tonle Sap lake. At HL, think like an economist: what is the stock, and is it growing or shrinking?

Practise this as you read

  • Separate the stock (capital) from what it yields (income).
  • Give three types of natural capital with real examples.

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Nature's bank account: Natural capital is the stock of natural resources available on Earth.

The points to remember

  • Natural capital is the stock of natural resources on Earth: what is there now.
  • It works like money in a bank: a stock that can give an income each year.
  • It can be living (a forest, a fish population) or non-living (groundwater, ice, metal ores).
  • It is measured as an amount: hectares of forest, tonnes of fish, cubic metres of water.
  • If the stock shrinks, there is less to use in the future.
Remember it as: Capital is the stock; income is what the stock gives each year.

Real example: the Ogallala Aquifer lies under eight US states and supplies about 30% of the groundwater used for irrigation in the USA. Where farmers pump faster than rain refills it, the stock of water is falling.

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The guide asks for local examples of three types of natural capital. Sort them by whether, and how, the stock renews.

Three types of natural capital

  • Living natural capital grows and reproduces: forests, fish stocks, farm soils' life, wild plants.
  • Non-living capital renewed by natural cycles: fresh water in rivers and aquifers, the ozone layer.
  • Non-living capital that does not renew in a human lifetime: oil, coal, metal ores, sand and gravel.
  • Find all three locally: a wood or park, a river or aquifer, a quarry or mine.
Table of three types of natural capital in Norway. Living: grows and reproduces, cod stocks in the Barents Sea. Non-living, renewed: natural cycles, mountain rivers and lakes. Non-living, not renewed: does not renew, oil and gas under the North Sea
One example of each type from one country.

Real example: Norway's cod stock renews as fish breed; its rivers are refilled by rain and snow; its oil and gas took millions of years to form and will not be replaced. One country, three types of capital.

Three different types: Three examples of the same type, such as three forests, show only one type. Pick one living, one renewed by cycles, one that does not renew.
Stock or flow?: Questions often give a fact file and ask for natural capital. Separate the stock from what it yields.

Capital or income?

  • Capital = the stock in the place: ice, water, nutrients, sediment, soil, trees, the fish population.
  • Income = what flows from it: the fish caught, the timber cut, the electricity made, the tourism money.
  • Asked for natural capital? Name the stock, never the income.
  • Mentioning a use is fine: 'water, used for hydropower' still names the capital, the water.

Natural capital (the stock)

  • Trees of the rainforest
  • Its soil
  • River water

Natural income (the yield)

  • Brazil nuts collected
  • Timber cut
  • Rain the forest recycles

Real example: in the Amazon the trees, soil and river water are the capital; the Brazil nuts gathered each year are income.

Not income: Tourism, hydroelectric power and money earned are income, not capital. They score nothing when the question asks for natural capital.

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How this comes up: Paper 1, from the resource booklet: identify forms of natural capital in a fact file.
Fact file on the Tonle Sap lake, Cambodia. Lake: each wet season the Mekong pushes water back into the lake, which grows to about five times its dry-season area. Fish: one of the richest stocks of freshwater fish in the world. Flooded forest: trees in the flood water shelter young fish. Silt: floods leave nutrient-rich silt on the farmland. Catch: fishing families sell their catch. Tourism: boat trips to floating villages. Temples: Angkor Wat lies a short drive north
Figure 1: a fact file like the ones in the resource booklet.
IB-style questionIdentify[2 marks]

Figure 1 is a fact file on the Tonle Sap lake in Cambodia.

With reference to Figure 1, identify two forms of natural capital provided by the lake.

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A village in Nepal owns a community forest. Each year the villagers cut some firewood and collect medicinal plants, but they never cut more than grows back.

the difference between natural capital and natural income, using the community forest.
[2 marks]

Related ESS HL Topics

Continue learning with these related topics from the same unit:

7.1.1Natural resources
7.1.3Natural income
7.1.4Natural capital as a perspective
7.1.5Ecosystem services
View all ESS HL topics

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