Lesson 2 unit 2 :Erosion of Ozone Layer and Global Warming (part2)

Erosion of Ozone Layer and

Global Warming

Second Global Warming

• Every day on the news, you may listen or watch sea level rise, repeated tropical hurricanes, flash floods, hot waves, drought and forest fires ….What happened to the earth’s climate? Why?

•  Researches of the IPCC (The Intergovernmental Panel on Climate Change), that follow UN, showed that there is an increase in the average temperature of the Earth’s near-surface air; a phenomenon known as Global warming which is caused by the greenhouse effect. 

 1-Interpretation of the greenhouse phenomenon :

When the concentration of greenhouse gases increases in the atmosphere, it plays the role of glass in the greenhouse  as it permits the visible light and short-waved radiation from the Sun to pass and be absorbed by Earth and its components which reemit the radiation back in the form of infrared radiation. Infrared radiation cannot penetrate the atmosphere as
it has a long wave-length. So it is kept trapped in the troposphere causing the rise of planet Earth temperature, a phenomenon known as greenhouse effect.

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And these are flashes about greenhouse phenomenon;

2-The negative effects of Global Warming Phenomenon

1- Melting of the ice and snow of both South and North Poles:

Melting of polar ice would increase sea level in seas and oceans, which represents a threat disappearance of coastal areas and that will lead to extinctions of some
polar animals like the polar bear.

2 -Severe climatic changes

Among these features is the repeated occurrence of tropical hurricanes  such as hurricane Katrina in 2005, destroying floods 

*These bad destructive effects made representatives of 160 nations in Kyoto, Japan in 1997to sign a protocol called Kyoto Protocol that suggested reducing the ratio of bad emission by cutting down the consumption of fossil fuel and searching for environmental friendly
alternative energy resources.

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