copy of global warming
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global warmingTRANSCRIPT
The human-induced climate change is already occurring and that future change is inevitable.
This summer's heat is consistent with
a long-term warming trend and looks to be
one of the hottest summers on record.
Global warming is A rise in temperature of the Earthcaused by emissions of carbon dioxide and other heat-trapping gases that are emitted primarily by the burning of fossil fuels and the clearing of forests. These gases remain in our atmosphere for decades or even centuries.
The atmosphere around us is made up of gases. Some of these gases function like the panes of a greenhouse: they let some radiation from the sun in but also retain heat in the atmosphere, that is: they don't let all radiation back out. As a result of this natural effect, it is warmer on Earth than it would be without these heat-trapping gases.This is called the greenhouse effect.
Human contributions of certain gases to the atmosphere have increased this greenhouse effect resulting in GLOBAL WARMING.
World's leading climate scientists feel that the Earth's temperature is rising and that its climate has changed over the last century. The scientific consensus is clear that the rise in temperature and change in climate are being caused in part by human activities.
Causes of global warming•Ozone hole
• heat-trapping-gases• aerosol emissions•over population•overuse of energy • economic growth• land use changes
•Burning of fossil fuels•Cement manufacture
•Deforestation
What is Ozone?
Ozone is a colorless gas. Chemically, ozone is very active;
it reacts readily with a great many other substances.
Near the Earth’s surface, those reactions cause rubber to crack,
hurt plant life, and damage people’s lung tissues.
But ozone also absorbs harmful components
of sunlight, known as “ultraviolet B”, or “UV-B”.
High above the surface, above even the weather systems,
a tenuous layer of ozone gas absorbs UV-B,
protecting living things below.
Each year for the past few decades during the Southern Hemisphere spring, chemical reactions involving chlorine
cause ozone in the southern polar region to be destroyed rapidly and severely.
This depletion is known as the “ozone hole”.
ozone hole
Future adverse impacts from Future adverse impacts from projected global warmingprojected global warming
extreme heat drought, rising sea levels, and higher-intensity tropical stormsrisk with our coastal property and resources,questionable livability of our cities in summer,Lower productivity of our farms, forests, and fisheries.Sea level riseChanges in precipitation patternsChanging climate conditionssevere stress on forests
Melting glaciersMelting glaciers
MELTING GLACIERS
1941
2004
Changes in precipitation patterns could have a significant impact,
especially in already water-scarce regions that are likely to suffer from further
decreasing rainfall
Changes in precipitation patterns
The ranges and abundance of plants and animals could change dramatically under changing climate conditions, and some of them are likely to be unable to adapt or migrate to new locations.
Changing climate conditions
Possible severe stress on forests due to rapid and greater warming
severe stress on forests
serious human health impacts,
Increasing heat stress, Worsening air pollution, Declining water quality,
Spread of infectious diseases
Sea level could rise by 3.5 to 34.6 inches between 1990 and 2100, making coastal groundwater saltier, endangering wetlands, and inundating valuable land and coastal communities.
Sea level rise
DroughtDrought
Tropical stormsTropical storms
Coastal property damage
Stress on forest life
Lower productivity of farms
Carbon dioxideCarbon dioxide
• Burning of fossil fuels,
• cement manufacture,
• deforestation and
• other land-use changes
Carbon dioxide (CO2) is one of those heat-trapping (greenhouse) gases that have increased significantly
in atmospheric concentration since pre-industrial times and thus has
raised the greatest concern.
MethaneMethane
• Livestock,
• wet rice agriculture,
• solid waste,
• coal mining,
• oil & gas production,
• biomass burning
Nitrous oxideNitrous oxide
• Nylon production,
• nitric acid production,
• biomass burning,
• cultivated soils,
• automobiles with three-way catalysts
Chlorofluoro-carbonsChlorofluoro-carbons(CFCs(CFCs))
• Chemical products & processes, including refrigeration,
• industrial solvents,
• blown-foam insulation
Sulphur hexafluoride (SF6)Sulphur hexafluoride (SF6)
• Chemical products and
• Chemical processes
Trifluoro-Trifluoro-methyl sulphur pentafluoride methyl sulphur pentafluoride
(SF5CF3)(SF5CF3)
• Unknown
• Minimal, but
• growing fast
Global warming is already under way. The evidence is vast and the urgency of taking action becomes clearer with every new scientific study. Some of the most obvious signs are visible in the Arctic,where rising temperatures and melting ice are dramatically changing the region’s unique landscapes and wildlife—as well as people’s lives and livelihoods.
Listen to the cry of mother Earth.
NOW THEGLOBAL WARMING SOLUTIONS………………………..
The global warming solutionsThe global warming solutionsareare
• Using energy more efficiently
• moving to renewable energy (wind, solar, geothermal, and bioenergy)
• increasing the efficiency of the cars we drive,
• reducing our dependence on oil and other fossil fuels that cause global warming
• vehicle technology solutions
We can’t avoid all the consequences of global warming,
but committing ourselves to action today can help ensure our children and grandchildren inherit a healthy world full of opportunity.
Let us spread awareness around
to save our planet from
further warming and
To reduce the existing level of warming.
To protect the health and economicwell-being of current and future generations,
we must reduce our emissions of heat-trapping gases by using the
technology, know-how, and practical solutions
already at our disposal.
WINDMILLUSING RENEWABLE SOURCES OF ENERGY
POLAR BEAR AT THE MERCY OF HUMANS
Save them.
Reduce global warming!
LET US MAKE A
” COOL EARTH CLUB”
IN OUR SCHOOL TO SPREAD AWARENESS
REGARDING THE PROBLEM OF GLOBAL WARMING
AND ITS SOLUTION.