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Climate Change
O The natural greenhouse effect
The warming of the atmosphere as some of its gases
absorb the heat given out by the Earth
O The enhanced greenhouse effect
The increases in the natural greenhouse effect, said
to be caused by human activities which increase the
quantity of greenhouse gases in the atmosphere…read more

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Causes of Climate
Change
O Radiation ­ energy travelling in the form of
electromagnetic waves
O Milankovitch cycles ­ three interacting astronomical
cycles in the Earth's orbit around the Sun, believed to
affect long-term climate change
O Volcanic eruptions ­ the materials given out when a
volcano erupts. These include gas, (mainly sulphur
dioxide) lava and ash…read more

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Causes of Climate
Change
How they link to climate change
O Volcanic eruptions
Mount St Helens (1980) and Mount Pinatubo are
examples of eruptions which released huge
quantities of volcanic dust
This blocked out sunlight and also caused increases
in cloud cover and rainfall for 1-2 years after…read more

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Causes of Climate
Change
How they link to climate change
O Earth orbital changes
Variations in the Earth's orbit are thought to be the
main factors affecting glacial cycles
Every so often the axis changes, together with the
position of the Earth in relation to the Sun…read more

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Causes of Climate
Change
How they link to climate change
O Solar variations
Solar energy ­ called `sunspots' ­ works in cycles, so
that the Sun's energy varies over short periods
It is quite possible that these affect global
temperature…read more

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