1.4.3

Natural Causes of Climate Change

Test yourself

Which Natural Things Can Change the Climate?

Below are some natural factors that are potential causes of climate change.

Illustrative background for Changes in the Earth's orbitIllustrative background for Changes in the Earth's orbit ?? "content

Changes in the Earth's orbit

  • The Earth's orbit around the Sun changes from circular to elliptical and back to circular over a period of 96,000 years. This is known as Milankovitch cycles.
  • When the Earth is closer to the sun, more of the sun's radiation will reach the Earth, warming it.
  • Orbital cycles could explain the interglacial eras.
Illustrative background for Volcanic activityIllustrative background for Volcanic activity ?? "content

Volcanic activity

  • Very large volcanic eruptions can change the atmosphere.
    • Particles can reflect the Sun's radiation away from Earth, cooling it down. This can be described as a volcanic winter.
    • Volcanic eruptions also release Carbon Dioxide, which is a greenhouse gas.
  • However, volcanic winters only last for a few years and would cool the earth down.
  • Volcanoes don't produce enough CO2 to explain global warming over 150 years.
Illustrative background for Solar output variationIllustrative background for Solar output variation ?? "content

Solar output variation

  • The Sun's energy output changes in cycles. It is possible that a period of high output could increase the Earth's temperature, however, the scientific consensus is that solar output variation cannot explain recent global warming.

Jump to other topics

1The Challenge of Natural Hazards

1.1Natural Hazards

1.2Tectonic Hazards

1.3Weather Hazards

1.4Climate Change

2The Living World

3Physical Landscapes in the UK

3.1The UK Physical Landscape

3.2Coastal Landscapes in the UK

3.3River Landscapes in the UK

3.4Glacial Landscapes in the UK

4Urban Issues & Challenges

5The Changing Economic World

6The Challenge of Resource Management

6.1Resource Management

6.2Food

6.3Water

6.4Energy

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