2. Index
What is
Who discovered
Greenhouse gases
Consequenses
Video
Conclusion
Bibliography
3. What is Greehouse Effect
Is a process by which thermal radiation
from a planetary surface is absorbed
by atmospheric greenhouse gases, and
is re-radiated in all directions. Since part
of this re-radiation is back towards the
surface, energy is transferred to the
surface and the lower atmosphere
The temperature there is higher than it
would be if direct heating by solar
radiation were the only warming
mechanism
4. Who discovered
Jean Baptiste Joseph Fourier (21 March 1768 – 16
May 1830) was a French mathematician and
physicist born in Auxerre and best known for
initiating the investigation of Fourier series and
their applications to problems of heat transfer
and vibrations. The Fourier transform and Fourier's
Law are also named in his honor.
5. Who discovered
In the 1820s Fourier calculated that an object the size of the Earth, and at
its distance from the Sun, should be considerably colder than the planet
actually is if warmed by only the effects of incoming solar radiation.
He examined various possible sources of the additional observed heat in
articles published in 1824 and 1827. Fourier's consideration of the possibility
that the Earth's atmosphere might act as an insulator of some kind is widely
recognized as the first proposal of what is now known as the greenhouse
effect.
6. Greenhouse Gases
Carbon dioxide (CO2) - Fossil fuel use is the primary source of
CO2. The way in which people use land is also an important
source of CO2, especially when it involves deforestation. Land
can also remove CO2 from the atmosphere through
reforestation, improvement of soils, and other activities.
Methane (CH4) - Agricultural activities, waste management,
and energy use all contribute to CH4emissions.
Nitrous oxide (N2O) - Agricultural activities, such as fertilizer use,
are the primary source of N2O emissions.
Fluorinated gases (F-gases) - Industrial processes, refrigeration,
and the use of a variety of consumer products contribute to
emissions of F-gases, which include hydrofluorocarbons (HFCs),
perfluorocarbons (PFCs), and sulfur hexafluoride (SF6).
7. Consequences
More drought and more flooding
Less ice and snow
More extreme weather incidents
Rising sea level
8. More drought and
more flooding
WHEN THE WEATHER GETS WARMER,
EVAPORATION FROM BOTH LAND AND
SEA INCREASES. THIS CAN CAUSE
DROUGHT IN AREAS OF THE WORLD
WHERE THE INCREASED EVAPORATION
IS NOT COMPENSATED FOR BY MORE
PRECIPITATION.
IN SOME REGIONS OF THE WORLD THIS
WILL RESULT IN CROP FAILURE AND
FAMINE ESPECIALLY IN AREAS WHERE
TEMPERATURES ARE ALREADY HIGH. THE
EXTRA WATER VAPOUR IN THE
ATMOSPHERE WILL FALL AGAIN AS
EXTRA RAIN, WHICH CAN CAUSE
FLOODING IN OTHER PLACES IN THE
WORLD.
9. Less ice and snow WORLDWIDE, GLACIERS ARE SHRINKING
RAPIDLY AT PRESENT. ICE APPEARS TO BE
MELTING FASTER THAN PREVIOUSLY
ESTIMATED. IN AREAS THAT ARE
DEPENDENT ON MELTWATER FROM
MOUNTAIN AREAS, THIS CAN CAUSE
DROUGHT AND LACK OF DOMESTIC
WATER SUPPLY.
ACCORDING TO THE IPCC, UP TO A SIXTH
OF THE WORLD'S POPULATION LIVES IN
AREAS THAT WILL BE AFFECTED BY
MELTWATER REDUCTION.
10. more extreme
weather incidents
THE WARMER CLIMATE WILL PROBABLY
CAUSE MORE HEATWAVES, MORE
VIOLENT RAINFALL AND ALSO AN
INCREASE IN THE NUMBER AND/OR
SEVERITY OF STORMS.
11. Rising sea level
SEA LEVEL RISES BECAUSE OF MELTING ICE
AND SNOW AND BECAUSE OF THE
THERMAL EXPANSION OF THE SEA (WATER
EXPANDS WHEN WARMED). AREAS THAT
ARE JUST ABOVE SEA LEVEL NOW, MAY
BECOME SUBMERGED.
SOME PACIFIC ISLAND NATIONS ARE
EXPECTED TO BE COMPLETELY
SUBMERGED BY THE END OF THE CENTURY.
IN COUNTRIES WITH LARGE AREAS OF
COASTAL LOWLAND THERE WILL BE A
DUAL RISK OF RIVER FLOODS AND
COASTAL FLOODING, WHICH WILL
REDUCE THE AREA FOR LIVING AND
WORKING. COASTAL DEFENCES WILL NEED
TO BE STRENGTHENED, AND RIVER LEVEES
WILL NEED TO BE DEVELOPED.
