Global warming: What is Causing it?

The Warming of the Earth Could Change the Way You Picture the

World!

Table of Contents• Slide 1……………………Title Slide• Slide 2……………………Table of Contents• Slide 3……………………Global Warming Video• Slide 4……………………Causes of Global

Warming• Slide 5……………………Contributors to Global

Warming• Slide 6……………………What’s Up With the

Ozone ?• Slide 7……………………Greenhouse Gases• Slide 8……………………This News Is not New!• Slide 9……………………Which Countries are

Contributors?• Slide 10………………….The Breakdown

Researchers around the world agree that the climate around the world is changing. Most people believe that the world’s population is contributing to this climate change. This idea is called Global Warming.

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Many scientists believe that some human activities cause global warming. Some of these activities include:

• Cutting down trees• Producing more trash• Polluting the environment• New Technologies that release greenhouse gases into the atmosphere.

There are, however, some scientist out there that do not believe that humans are contributing to the climate change. Some researchers believe that there is a natural warming pattern that the earth is following

Causes of Global Warming

17%

9%

14%

3%

57%

CFC'sForestryAgricultureOtherEnergy

What in the world is a CFC?CFC stands for

Chlorofluorocarbons. These are chemicals made up of carbon, fluorine and chlorine atoms. These chemicals are very

harmful to the environment and are the one of the main

contributors to the ozone depletion. CFC’s are often

found in household cleaning solutions, hairsprays, and

spray paints.

Contributors to Global Warming

The ozone is a layer of gases that protects the earth from harmful UV rays. The CFC’s and other chemicals that are being produced and released are burning holes in the ozone layer! If nothing is done to stop these gases from being released the ozone layer will soon be completely gone. The ozone layer is very fragile. Therefore, does not take much to destroy it. When CFC’s reach the ozone layer the extreme amount of ultra violet rays breaks them apart. As they break apart they release chlorine atoms. The chlorine atoms then join the oxygen atoms that are put out by the ozone. This combination burns holes in the ozone layer. These holes now allow more harmful and heat causing rays to reach the earth.

GREENHOUSE GASESGreenhouse gases are gases that blanket the earth and absorb heat . This heat absorption helps to keep the world warmer then it would be with out them. The greenhouse gases are carbon dioxide, nitrous oxide, and methane.

• Carbon Dioxide is released into the atmosphere by the burning of solid waste, wood, wood products, and fossil fuels (coal, oil, and natural gas)

• Nitrous Oxide emissions occur during various agriculture and industrial processes, and when solid waste and fossil fuels are burned.

• Methane is emitted when organic waste decomposes (through livestock farming), and also during production and transportation of fossil fuels.

The overproduction of these gases is leading to the over heating of the earth.

1827 French polymath Jean-

Baptiste Fourier suggests the existence of an atmospheric effect

keeping the Earth warmer than it would otherwise be. He also uses the analogy

of a greenhouse.

1890’s to 1940

Average surface air temperatures increase

by about 0.25 °C. Some scientist see the

American Dust Bowl as a sign of the

greenhouse effect at work.

1957US oceanographer

Roger Revelle warns that people are

conducting a "large-scale geophysical experiment" on the planet by releasing greenhouse gases.

Colleague David Keeling sets up first

continuous monitoring of CO2

levels in the atmosphere.

Immediately Keeling finds regular year-

on-year rise.

1987 Warmest year on

record. The 1980s turn out to be the warmest decade, with seven of

the eight warmest years recorded up to 1990.

Even the coldest years in the 1980s were warmer than the

warmest years of the 1880s.

Energy Used by Countries

(Measured in Millions of BTU’s)

Japan Germany USA

147 190 340

340

190147

050

100150200250300350

Millions of BTU's used

USA Germany Japan

Countries

Energy Used

Most countries are guilty to contributing to global warming, but the most industrialized countries use the most energy. Therefore, they are most to

blame for the increase in the Earth’s temperatures.

Look who uses the most energy!!!Are you surprised?

Here is another way to look at

It!

CFC's are emitted andgo into the atmosphere

The CFC's breakdown and join with oxygen that is released by theozone. These chemicals combined burn holes through the

ozone layer.

The holes in the ozone layer are allowing more heatcausing rays from the sun to reach the earth.

Now, because of the overproduction of greenhouse gasesthis heat is being absorbed instead of released.

Causes Of Global Warming