global warming and its impacts (66)
TRANSCRIPT
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.
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
Arctic ice belts are
melting
To view the video of Glacier melting click here