Global warming - Science Vs Myth
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Transcript of Global warming - Science Vs Myth
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Science Vs Myth
Shivantha Withanage©
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What is Global Warming?
It is the natural way of keeping a planet warm.
But human activities have caused disastrous variations in this natural system.
So, global temperature is rising
beyond the critical point.
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Chronicles of Global Warming.
Charles David Keeling
Mauna Loa, Hawaii
1958
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Green House Gases.
CO2
Methane
CFCs
Ozone
Nitrous
Oxide
H2O(g)
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How do GHGs warm the atmosphere?
The warming effect of a molecule depends on its molecular vibrations.( Not on number of atoms)
If, Molecular vibration = Frequency of I.R frequency waves Then that molecule can act as a warming
substance.
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Effects of Global Warming.
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Global Cooling Effect.• Pinatubo stratvolcano- Philippines, 15th of June 1991
• 20 million tons of SO2 and ash.
• 20 km up through the atmosphere.
• Global temperature reduction- 0.4℃ - 0.5℃
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Your contribution to destroy the earth!!
Your one day computer usage emits 1.1 kg of CO2
Turning on a light for six hours emits 680 g of CO2
Taking a bath uses up to 1.6 kg of CO2
Riding in a gasoline car for 4 km emits 2.3 kg of CO2
All humans the world over add
100 million tons of CO2
into the atmosphere each day.
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How can we stop this?? Reduce the emission of GHGs.• Use carbon filters.• Use electricity and petroleum properly.• Use public transportation services.• Say “No” to coal and petroleum power & promote alternative
energy sources.• Avoid using polythene.
Protect forests and plant trees.
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If we fail in this task, the only solution is
Adaptation
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It’s your choice.
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Thank You!Thank You!
live for today & save the future.