تعبير انجليزي عن تغير المناخ
موضوع عن الطقس باللغة الانجليزية
موضوع عن تغير المناخ
تعبير عن المناخ
تعبير بالانجليزي عن الطقس في السعوديه
causes of climate change
تغير مناخ الارض
مقدمة عن تغير المناخ
الاحتباس الحراري بالانجليزي
موضوع تعبير باللغة الانجليزية عن تغير المناخ
potential impacts of climate change
impact of climate change - أمثلة ...
paragraph about Weather
موضوع عن تغير المناخ
التغير المناخي pdf
حلول لتغير المناخ
توقع مستقبل المناخ
بحث عن التغيرات المناخية doc
اثار التغير المناخي
حل مشكلة التغير المناخي
تغير المناخ في الجزيرة العربية
التغير المناخي في السعودية
الاحتباس الحراري بالانجليزي
موضوع عن الاحتباس الحراري
موضوع قصير عن الاحتباس الحراري باللغة الانجليزية
موضوع عن الاحتباس الحراري مختصر
جمل عن الاحتباس الحراري
موضوع مختصر عن الاحتباس الحراري بالانجليزي
جمل عن global warming
اسباب الاحتباس الحراري باختصار
موضوع تعبير عن الاحتباس الحراري
position: relative; vertical-align: baseline; top: -0.5em;">e siècle. Chacune des trois dernières décennies a été plus chaude que toutes les décennies précédentes depuis le début des relevés statistiques, en 1850.
Les plus grands climatologues mondiaux pensent que les activités humaines sont très probablement la principale cause du réchauffement observé depuis le milieu du XXesiècle.
Ils considèrent qu'une augmentation de 2°C par rapport à la température de la période préindustrielle est le seuil au-delà duquel le risque d'assister à des changements climatiques dangereux, voire catastrophiques, est beaucoup plus élevé. Pour cette raison, la communauté internationale a reconnu la nécessité de maintenir le réchauffement de la planète en dessous de 2 °C.
The causes
of climate change
Causes and
consequences of climate change
Human
activities such as the use of fossil fuels, the exploitation of tropical
forests and the raising of livestock have an increasing influence on the
climate and the temperature of the earth.
These
activities release enormous quantities of greenhouse gases, in addition to
those naturally present in the atmosphere, thus enhancing the greenhouse effect
and global warming.
Greenhouse
gas
Some gases
in the earth's atmosphere act like a greenhouse wall: they allow solar energy
to enter the atmosphere but prevent it from escaping.
Many of
these gases are naturally present in the atmosphere, but human activity
increases the concentrations of some of them in the atmosphere, in particular:
carbon dioxide
(CO2);
methane;
nitrous
oxide;
fluorinated
gases.
CO2 is the
most common greenhouse gas produced by human activities; it is responsible for
63% of the warming of the planet caused by man. Its concentration in the
atmosphere is currently 40% higher than at the beginning of industrialization.
Other
greenhouse gases are emitted in smaller quantities, but they retain heat much
more efficiently than CO2 and are up to 1000 times more powerful. Methane is
responsible for 19% of the global warming caused by man, while this proportion
is 6% for nitrous oxide.
The causes
of the increase in emissions
The
combustion of coal, oil and gas produces carbon dioxide and nitrous oxide.
The
disappearance of forests (deforestation). Trees help to regulate the climate by
absorbing carbon dioxide (CO2) from the atmosphere. So when they are
slaughtered, this positive effect is lost and the carbon stored in the trees is
released into the atmosphere, exacerbating the greenhouse effect.
The increase
in livestock. Cattle and sheep produce large amounts of methane when digesting
their food.
Fertilizers
containing nitrogen produce emissions of nitrous oxide.
Fluorinated
gases have a considerable warming effect, up to 23,000 times that of CO2.
Fortunately, they are released in smaller quantities and are gradually banned
by EU regulations.
Global
warming
Power plants
and other industrial facilities are the main emitters of CO2
The average
temperature of the planet has increased by 0.85ºC compared to the end of the
19th century. Each of the last three decades has been warmer than all previous
decades since the beginning of statistical surveys in 1850.
The world's
largest climatologists believe that human activities are most likely the main
cause of global warming since the mid-20th century.
They
consider that an increase of 2 ° C over the pre-industrial temperature is the
threshold beyond which the risk of attending dangerous or even catastrophic
climate changes is much higher. For this reason, the international community
has recognized the need to keep global warming below 2 ° C.
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