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

Flood

Drought

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

To view the video of Glacier melting click here