Course: Application Software 1 (432-200C) Date : Tuesday, June 11, 2002.

Course: Application Software 1 (432-200C)Course: Application Software 1 (432-200C)Date : Tuesday, June 11, 2002Date : Tuesday, June 11, 2002

In the beginning. . .In the beginning. . .

He made heaven and earth !!He made heaven and earth !!

But Earth was dark and empty, and He said, . . .But Earth was dark and empty, and He said, . . .

How much light ?How much light ?

Just the right amount to create a Just the right amount to create a perfect world !perfect world !

But in the 1800s – something happened.But in the 1800s – something happened.

A REVOLUTION ! A REVOLUTION !

at some of the effects!at some of the effects!

What is my topic?What is my topic?

What revolution triggered the onset What revolution triggered the onset of global warming?of global warming?

Industrial RevolutionIndustrial Revolution

What does global warming What does global warming mean?mean?

It is getting hotter and hotter out there.It is getting hotter and hotter out there.

Background ScienceBackground Science

The layers of earth’s atmosphereThe layers of earth’s atmosphere

More about the troposphere layerMore about the troposphere layer

SomeSome of the other gases have the ability of the other gases have the ability to trap some forms of solar energyto trap some forms of solar energy

Oxygen 21%

Other gases1%

Nitrogen78%

Source of EnergySource of Energy

The sun emits different types of rays – not The sun emits different types of rays – not all reach the surface of the earthall reach the surface of the earth

What are some of the greenhouse gasesWhat are some of the greenhouse gases??

• carbon dioxidecarbon dioxide

• water vapourwater vapour

• methane – cows & termites producemethane – cows & termites produce

• nitrous oxide – automobile exhaust containsnitrous oxide – automobile exhaust contains

• CFCs – man-madeCFCs – man-made

More about CFCsMore about CFCs• CFCs rise slowly into the stratosphere layerCFCs rise slowly into the stratosphere layer

• Decomposed by uv rays releasing chlorineDecomposed by uv rays releasing chlorine

• One chlorine atom can destroy 100 000 One chlorine atom can destroy 100 000 molecules of ozonemolecules of ozone

OverallOverall

deplete the ozone in thedeplete the ozone in the CFCs stratosphere layerCFCs stratosphere layer

are powerful greenhouse gases in the are powerful greenhouse gases in the troposphere layertroposphere layer

SummarySummary

• Man-made greenhouse gases are Man-made greenhouse gases are responsible for global warming.responsible for global warming.

• Man is to blame! – Man is to blame! – There were warnings!There were warnings!

• Greenhouse gases make up a small Greenhouse gases make up a small percentage of the atmosphere.percentage of the atmosphere.

• A small change in the quantity of A small change in the quantity of greenhouse gases can have a greenhouse gases can have a devastating effect.devastating effect.