PowerPoint Presentation

Global warming and it's impact

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Created by, M.Kohila,M.Phil.(Tam),B.A(Eng), Secondary grade teacher, S.M.R.V.H.S.S., Vadasery, Nagercoil, Kanyakumary district, TAMILNADU-6290012Teaching objectivesTo understand about the green house gases.To undertstand about the infrared radiations.To understand about the air pollution.To understand about the green house effect.To understand about the global warming.To understand about the effects of global warming.3

The glass panels of the greenhouse let in light but keep heat from escaping. This causes the greenhouse to heat up.Green house

Greenhouses are used to grow plants, especially in the winter. Greenhouses work by trapping heat from the sun4

water vapour

COOCarbon dioxide (CO2)Green house gases

methane (CH4)

Nitrous oxide (N2O)

Ozone (O3)Hydrofluorocarbons (HFCs).Any gas that absorbs infra-red radiation in the atmosphere.

COO

Halogenated Chloro fluoro carbons (HCFCs) 5

Green house effectCarbondioxide present in the atmosphere absorbs infrared radiations reflected from the surface of the earth and heats up the atmosphere.This heating up of atmosphere by carbondioxide in the air is called green house effect.6

Sources of green house gases7

Smoke comes out from the factories8

Greenhouse gases in the atmosphere behave much like the glass panes in a greenhouse.9But if the greenhouse effect becomes stronger, it could make the Earth warmer than usual. Importance of the greenhouse effect

Without the greenhouse effect, the Earth would not be warm enough for humans to live.

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Global warmingBecause of Green house effect the average temperature of the earth increases and this is known as Global warming11

Sunlight enters the Earth's atmosphere, passing through the blanket of greenhouse gases.12

Sunlights energy emains trapped in the atmosphere13Impacts of global warming

14Droughts Floods Level Rising temperatures of oceans and the sea Tornadoes HurricanesThe melting of mountain glaciersThe reduction of snow cover Dying coral reefsCoastal erosionLoss of coastal ecosystems Extra warming may cause problems for humans, plants, and animals. Impacts of global warming

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Flood16

Drought17

Level Rising of oceans and the sea

Hurricanes18

In 1999In 2004

Coastal erosion

Dying coral reefs19

TornadoMelting of mountain Glaciers

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Arctic continent ice melts

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Antartica ice continent melts

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Arctic ice belts are meltingThe melting of mountain glaciersTo view the video of Glacier melting click here23

In 1859In 2001The melting of mountain glaciers24

In 1928In 2004The reduction of snow cover25

In 1985In 2002Extra warming may cause problems for plants26

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Speech on Global warming and its impacts (24-06-2008)Dr.Santhanakumar,District co-ordinater,National Green corps,Kanyakumary districtTo view this video Click here

28Poster on Global warming is issued to school students

29The End Thank you

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