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GLOBAL WARMING. The greenhouse effect is the name applied to the process which causes the surface of the Earth to be warmer than it would have been in the absence of an atmosphere. Global warming or the enhanced greenhouse effect

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GLOBAL

WARMING


The greenhouse effect is the name applied to the process

which causes the surface of the Earth to be warmer than it would have been in the absence of an atmosphere.

Global warming

or the enhanced greenhouse effect

is the name given to an expected increase in the magnitude of the greenhouse effect, whereby the surface of the Earth will amost inevitably become hotter than it is now.


About 70% of the sun's energy is radiated back into space.

But some of the infrared radiation is trapped by greenhouse gases

and warms the atmosphere,


Water vapour accounts for 98% of the natural Greenhouse effect.

Water vapour has lower ‘radiative forcing’ properties than

some other atmospheric gases such as

carbondioxide, methane and nitrous oxide

which are naturally present in the atmosphere

in small quantities.

Since the Industrial Revolution the proportion

of these gases has increased significantly.


N2O

CFCs

CO2

CH4

1 Carbon Dioxide > fossil fuels, vehicle emissions, forest clearance

2 Methane > rice cultivation, biomass burning, digestive fermentation,

termites, sewage, landfill, natural gas production

3 CFCs > aerosol propellants, refrigerants, foaming agents

4 Nitrous oxide > nitrogen fertilisers, industrial pollution


CONCENTRATION CHANGES SINCE 1750

Carbon Dioxide: 280 ppm 360 ppm (+30%)

Methane: 0.70 ppm 1.80 ppm (+145%)

Methane c25 x effect of CO2

CFCS (chlorofluorocarbons)

recent significant decrease due to concern

about OZONE LAYER

BUT

CFCs c10,000 x effect of CO2



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