global warming - science vs myth

Science Vs Myth

Shivantha Withanage©

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.

Chronicles of Global Warming.

Charles David Keeling

Mauna Loa, Hawaii

1958

Green House Gases.

CO2

Methane

CFCs

Ozone

Nitrous

Oxide

H2O(g)

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.

Effects of Global Warming.

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℃

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.

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.

If we fail in this task, the only solution is

Adaptation

It’s your choice.

Thank You!Thank You!

live for today & save the future.