Global warming by robin
Transcript of Global warming by robin
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GLOBAL WARMING
A PRESENTATION BYROBIN
X F
GLTSBM
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Global Warming• an average increase in
the temperature of the atmosphere near the Earth’s surface and in the troposphere1, which can contribute to changes in global climate patterns
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Causes • Burning of fossil fuels (Coal/Crude oil)
– Power plants generate electricity
– Transportation-----fuels for transports (E.g. LPG,
kerosene, fuel oil)
– Industrial processes (E.g. manufacture of cement, steel, aluminium)
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Causes• Other greenhouse
gases emission
– Agriculture– Forestry– Other land uses– Waste management
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Besides carbon dioxide, other
gases such as methane,
chlorofluorocarbons, nitrogen
oxides and ozone also
contribute to the greenhouse
effect.
Example : Using natural gas to cook CH4 + 2O2 CO2 + 2H2O
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Greenhouse gases in the atmosphere↓
Some infrared radiation is trapped ↓
Greenhouse effect
Serious greenhouse effect
Global Warming
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How serious the problem is?...
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Increase in greenhouse gases• Concentration of greenhouse gases
in the atmosphere is highly increasing by human activities
→ Leads to the increasing seriousness of global warming
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Global surface temperatures
– increased about 0.6°C/century since the late19th century
– increased to 2°C/century over the past 25 years
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Increase in Global temperatures
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Temperature difference between different parts of atmosphere• troposphere temperatures (the
lowest 8 kilometers of the Earth's atmosphere) collected since 1979 also indicate warming
• Cooling effect in higher parts of the atmosphere: stratospheric temperatures have been decreasing
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Increasing temperature extremes• Regions that have temperatures (1-
3°C) warmer than the average: – United States – Most of the Europe
• Regions that have temperatures (1-3°C) cooler than the average: – Australia
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Sea level rising• rising at an average rate of 1 - 2
mm/year over the past 100 years
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Environmental and Human
Effects
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Air QualityAn increase in the
concentration of ground-level ozone
Damage lung tissue
Harmful for those with asthma and other chronic lung
diseases
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Food supply
Rising temperatures and variable precipitation
Decrease the production of staple foods in many of the poorest
regions
Increasing risks of malnutrition
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Population displacement
Rising sea levels
Increase the risk of coastal flooding
(Necessitate population displacement)
• More than half of the world's population now lives within 60km of the sea.
• Most vulnerable regions: Nile delta in Egypt, the Ganges-Brahmaputra delta in Bangladesh, many small islands, such as the Maldives, the Marshall Islands and Tuvalu.
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Measures on controlling the problem
• Government
* set some laws to limit the amount of pollutants produced by factories
* develop the skills of using renewable fuels, e.g. solar energy, wind energy
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* encourage the factories to replace fossil fuels by renewable fuels, which would not cause environmental pollution
* carry out energy saving scheme → reduce the pollution produced by burning fossil fuels
* build more plants → reduce the pollutants e.g. CO2
Measures on controlling the problem
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THE END