Level 3 Environmental Science WJEC

This subject is broken down into 19 topics in 4 modules:

  1. The Sustainable Use of Resources 6 topics
  2. Biological Resources on Earth (Global Ecosystems) 3 topics
  3. Agriculture 5 topics
  4. Sustainability 5 topics
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  • 4
    modules
  • 19
    topics
  • 7,834
    words of revision content
  • 1+
    hours of audio lessons

This page was last modified on 28 September 2024.

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Environmental Science

The Sustainable Use of Resources

Introduction to Environmental Science

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Introduction to Environmental Science

Introduction to Environmental Science

This section introduces the basics of environmental science, including key terminology and an overview of key concepts:

  • Environmental science combines different disciplines to study the relationship of humans with the environment.
  • The environment comprises all the physical and biological elements that influence the life of organisms.
  • Ecosystems include both the community of organisms in an area and their physical surroundings.
  • Biodiversity refers to the variety of life found in a certain habitat. It includes variety within species, between species, and the variety of ecosystems.
  • Sustainability is the capacity of ecosystems to maintain their essential functions and processes into the future.

The Impact of Humans on the Environment

Understanding the impact of human activities on the environment is fundamental.

  • Deforestation is the removal of a forest or stand of trees where the land is thereafter converted to non-forest use.
  • Pollution, whether in the air, water or land, has detrimental effects on the environment and biodiversity.
  • Overpopulation increases the demand for natural resources, leading to overexploitation, degradation, and loss of habitats.
  • Climate change is caused by human activities and greatly impacts ecosystems.

Sustainable Use of Resources

Learn how to use natural resources in a way that meets human needs while preserving the environment.

  • Renewable resources such as sunlight, wind, and water, are replenished naturally and are environmentally friendly sources of energy.
  • Non-renewable resources, including oil, gas, and coal, are finite and their extraction and use result in environmental damage.
  • Recycling involves the conversion of waste into materials that can be used again, reducing the need for new resource extraction.
  • Conservation efforts aim to protect and preserve the natural environment for future generations.

Environmental Policy and Legislation

Laws and regulations play a vital role in environmental preservation and sustainable use of resources.

  • Environmental regulations are rules and standards established by governments to manage and conserve natural resources.
  • Legislations like the Clean Air Act, and Water Framework Directive, aim to protect air, water, soil and biodiversity.
  • The Kyoto Protocol and the Paris Agreement are global efforts to mitigate the impacts of climate change.
  • Implementing sustainable practices reduces environmental damage and assists in the conservation of biodiversity.

Course material for Environmental Science, module The Sustainable Use of Resources, topic Introduction to Environmental Science

Environmental Science

Agriculture

Crops and Cropping Systems

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Crops and Cropping Systems

Crops and Cropping Systems

Understanding Crops and Cropping Systems

  • Crops are plants grown on a large scale for food, fibre or other products.
  • A cropping system refers to the way these crops are cultivated on a particular farm.
  • Cropping systems are chosen based on factors like climate, market demand, soil type, and availability of capital and labour.

Main Types of Crops and Cropping Systems

  • There are many types of crops, including cereals (e.g. wheat, barley), fruits and vegetables, fibre crops (e.g. cotton), forage crops (for feeding livestock), and cash crops (e.g. tea, coffee).
  • Monocropping, also known as monoculture, involves growing a single crop year after year on the same land.
  • Multiple cropping involves growing more than one crop on the same plot of land in a given year.
  • Inter-cropping is a practice whereby two or more crops are grown at the same time on the same land.

Advantages and Disadvantages of Different Cropping Systems

  • Monocropping can lead to higher yield and efficiency, but it can deplete soil nutrients and make crops susceptible to pests and diseases.
  • Multiple cropping improves soil fertility and crop yield, provides a balanced diet, and reduces risk, but it requires careful management of crops.
  • Inter-cropping helps maximise yield, promotes diversity, and reduces dependency on fertilisers and pesticides, but it might lead to competition between crops for resources.

Factors Influencing Choice of Crop and Cropping System

  • The choice of crop and cropping system can be influenced by local climate conditions, the quality and fertility of the soil, available technology and machinery, market demand, scale of farming, and the economic conditions of the farmer.

Transition to Sustainable Cropping Systems

  • Sustainable cropping involves farming practices that are economically viable, environmentally friendly, and socially responsible.
  • It emphasises soil conservation, biodiversity, reduction of chemical inputs, and efficient use of water resources.
  • Examples of sustainable cropping systems include organic farming, integrated farming, conservation agriculture, and agroforestry.

Impact of Climate Change on Crops and Cropping Systems

  • Climate change affects crop production and cropping systems through changes in temperature, rainfall, and the intensity and frequency of extreme weather events.
  • It may lead to changes in the distribution and productivity of crops, and can increase the risks of pests and diseases.
  • Farmers need to adapt to such changes by altering the types of crops they grow, adopting new farming practices, or by investing in new technologies.

Course material for Environmental Science, module Agriculture, topic Crops and Cropping Systems

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