1.4.3

Natural Causes of Climate Change

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Which Natural Things Can Change the Climate?

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

Changes in the Earth's orbit

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.
Volcanic activity

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.
Solar output variation

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
1

The Challenge of Natural Hazards

1.1

Natural Hazards

1.2

Tectonic Hazards

1.3

Weather Hazards

1.4

Climate Change

2

The Living World

2.1

Ecosystems

2.2

Tropical Rainforests

2.3

Hot Deserts

2.4

Tundra & Polar Environments

3

Physical Landscapes in the UK

3.1

The UK Physical Landscape

3.2

Coastal Landscapes in the UK

3.3

River Landscapes in the UK

3.4

Glacial Landscapes in the UK

4

Urban Issues & Challenges

5

The Changing Economic World

5.1

The Changing Economic World

5.2

Economic Development in the UK

6

The Challenge of Resource Management

6.1

Resource Management

6.2

Food

6.3

Water

6.4

Energy

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