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Human Impact on the Environment

Agricultural Exploitation, Conservation Conflicts and Sustainability

  • 3 things to know
  • A2 Unit 3

Overview

Recall questions on Agricultural Exploitation, Conservation Conflicts and Sustainability.

What you need to know

Answer each one before you reveal it.

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Key term

How does selective logging reduce the damage done by timber extraction?

Key term

Why does the removal of the largest fish damage a stock disproportionately?

Key term

Explain why increasing the legal mesh size can be more effective than a quota alone.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is the essential conflict between agricultural exploitation and conservation?

    Model answer

    A growing human population needs ever more food, timber and land, but meeting that demand destroys the habitats and species that conservation seeks to protect.

  2. 2

    Give three reasons why tropical forest is cleared.

    Model answer

    To obtain hardwood timber and fuel, to create land for crops such as oil palm and soya, and to create pasture for cattle.

  3. 3

    Give four environmental consequences of deforestation.

    Model answer

    Loss of habitat and of the species that depend on it, an increase in atmospheric carbon dioxide as a carbon sink is removed and the wood burned, soil erosion and leaching once the roots and canopy are gone, and disruption of the water cycle with less transpiration and more flooding.

  4. 4

    How does selective logging reduce the damage done by timber extraction?

    Model answer

    Only mature trees of the required species are taken, so the canopy and the habitat largely remain and the forest regenerates naturally from the trees left standing.

  5. 5

    What is coppicing?

    Model answer

    It is the cutting of a tree back to its base so that new shoots grow from the stump, giving a repeated harvest of timber without killing the tree.

  6. 6

    Suggest how ecotourism can help to resolve the conflict between exploitation and conservation.

    Model answer

    It gives the local community an income from the forest and its wildlife while they remain intact, so conserving the habitat becomes more profitable than clearing it.

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