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Global warming
Greenhouse effect has bigger influence over
temperature of earth rather than Earth's proximity
to the sun
Pathways of solar radiation:
Passes through the clear atmosphere
Most absorbed by Earth's surface
Some reflected by earth and atmosphere
Infrared emitted from surface of Earth
Some passes through atmosphere
Some is absorbed by the earth's surface and re-emitted
in all directions by gas molecules
Lower atmosphere and surface of Earth is warmed up…read more

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The greenhouse effect
This is when atmospheric gases absorb and
subsequently emit infrared radiation which
warms the lower atmosphere and the surface
of the planet
Greenhouse gases:
Water vapour ­ evaporation of oceans, lakes etc
Carbon dioxide ­ volcanic eruptions, animal
respiration and burning decay
Methane ­ product of rotting waste, by-product
of digestion for many animals, production of
fossil fuels…read more

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Absorption of radiation
Bonds of gas molecules can absorb infrared
radiation which causes the molecule to vibrate
Eventually, the vibrating molecules can emit
some of the energy as radiation
The radiation emitted can be absorbed by other
greenhouse gas molecules or by the surface of
the Earth
The greenhouse effect of a gas depends on:
Its concentration in the atmosphere
Its ability to absorb infrared radiation…read more

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GWP stands for global warming potential
The GWP of a gas is its ability to cause global
Some CFCs have a much greater ability at
absorbing IF radiation, but their effect is
diminishing since they became banned
There are other molecules that have a greater
GWP than gases like carbon dioxide, but they
are in very small concentrations and so do not
have much of an effect…read more

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Evidence of global warming
Arctic ­ ice and permafrost melting
Antarctic ­ ice sheet is melting into oceans
Tropical areas- experiencing more frequent
and destructive storms and floods
Disappearing glaciers in Europe as well as heat
waves…read more

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