Edexcel AS Geography Unit 1 - Global Challenges (6GE01), Topic 1 (World at Risk), Section 4 - Climate Changes and its causes - Part B Revision

A PowerPoint with information on the natural and human causes of climate change. Specifically created for revision for Edexcel AS Geography Unit 1. This is the follow on from Part A (obviously!) and looks at the various causes of climate change, including natural and anthropogenic. Despite being targeted for Edexcel, it is definitely useful for all other exam boards as well as for all qualification tiers (e.g. GCSE, AS/A2)

Natural causes include:

  • Variations in the Earth's orbit (Milankovitch Cycles - Stretch, Tilt and Wobble)
  • Variations in Solar output (Sunspots)
  • Meteor/Asteroid impacts
  • Volcanic eruptions

Human causes include:

  • Enhanced greenhouse gas emissions
  • Destruction of natural CO2 sinks

* Please view the PowerPoint in Slide Show mode in order to prevent pictures over riding text *

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The causes of Climate Change may be
Natural and Human
· Some changes in climate are caused by changes in
how the Sun's energy is received, trapped and
distributed around the Earth
­ E.g. When more energy is received, the Earth will get
hotter
­ When less energy is received, the Earth will get cooler
· However, some changes in climate are caused by
human activity…read more

Slide 3

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EARTHS CLIMATE CHANGES
NATURALLY ...…read more

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1) Variations in the Earth's orbit
· The way the Earth moves around the sun affects the
way the Earth receives energy from the Sun.
· Earth's movement around the sun gradually changes
in three ways, which in turn affect global climate
· These are often referred to as the `Milankovitch
Cycles' and include: Stretch, Tilt and Wobble.…read more

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Stretch (Eccentricity)
· The path of the Earth's orbit around the Sun
changes from an almost perfect circle to an ellipse
and back again about every 96,000 years
· This changes the distance from the Sun to the Earth,
and so the amount of energy the Earth receives from
the Sun (at different times of the year)
· Earth's orbit is elliptical right now ­ it is closest to the
Sun in January and furthest away in July…read more

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Tilt (Obliquity)
· The Earth is tilted at an angle as it orbits the Sun,
called its axis (currently 23.5°)
· This changes between about 21.8° and 24.4° over a
cycle of about 41,000 years
· The change in tilt changes the amount of energy that
different latitudes receive, changing global climate
· When the tilt is greater (24.4°) areas that receive lots
of energy, such as the tropics, will be larger.
· Other climate regions, such as the temperate zones
beyond the tropics, will be smaller…read more

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