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-629001

Teaching objectives

• To 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.

• 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 sun

water vapour

C OO Carbon dioxide (CO2)

Green house gases

methane (CH4)

Nitrous oxide (N2O)

Ozone (O3)

Hydrofluorocarbons (HFCs).

Any gas that absorbs infra-red radiation in the atmosphere.

C OO Halogenated Chloro fluoro carbons (HCFCs)

Green house effect

Carbondioxide 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.

Sources of green house gases

Smoke comes out from the factories

Greenhouse gases in the atmosphere behave much like the glass panes in

a greenhouse.

But 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.

Global warming

Because of Green house effect the average temperature of the earth increases and this

is known as Global warming

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

Sunlight’s energy emains trapped in the atmosphere

Impacts of global warming

• Droughts• Floods • Level Rising temperatures of oceans and

the sea • Tornadoes• Hurricanes• The melting of mountain glaciers• The reduction of snow cover• Dying coral reefs• Coastal erosion• Loss of coastal ecosystems• Extra warming may cause problems for

humans, plants, and animals.

Impacts of global warming

Flood

Drought

Level Rising of oceans and the sea

Hurricanes

In 1999

In 2004

Coastal erosion

Dying coral reefs

Tornado Melting of mountain Glaciers

Arctic continent ice melts

Antartica ice continent melts

Arctic ice belts are melting

The melting of mountain glaciers

To view the video of Glacier melting click here

In 1859 In 2001The melting of mountain glaciers

In 1928

In 2004

The reduction of snow cover

In 1985 In 2002

Extra warming may cause problems for plants

Speech on Global warming and its impacts (24-06-2008)

Dr.Santhanakumar,District co-ordinater,National Green corps,Kanyakumary district

To view this video Click here

Poster on Global warming is issued to school students

The End Thank

you