global warming and its impacts
DESCRIPTION
Dear educators / Students,You can view and download this PPt for your education purposes.'Think Innovative'KohilaTRANSCRIPT
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