740-upd8 global warming swindle presentation

7/27/2019 740-Upd8 Global Warming Swindle Presentation

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A Channel 4 documentary " The Great Global

Warming Swindle"claims that man-made global

warming is "a lie"and "the biggest scam of

modern times."The documentary says the Earth

has warmed and cooled throughout history. The

recent climate changes are natural, it claims.

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What is a theory?Theories are ideas created byscient is tsto explain why things happen.

A theory explains evidence from

observations or experiments.

It predictsfuture

observations.

A theory can b e testedby making observations

and doing experiments.

Climate change

The Earth's climate has always been

changing.

Now, climatechange

means

changes in

our climate

sin ce 1900.

Global warm ing

Global warming is the r ise in

temperatureof the Earth's atmosphere.

Many scientistsbelieve that

greenhouse

gases cause

global warming.

Global warming c auses cl imate change.

Greenhouse gasesGreenhouse gases trap heat from theSun. They make up about 1% of theEarth's atmosphere.

Carbon dioxide (CO2)is a greenhouse gas.

Without greenhousegases, the Earth wouldbe 30C colder.

Humans cou ld not surv ive.


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There is evidence that

thewor ld is get tingwarmer.

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There is evidence that

the curren t temperatu rer ise is unusual.

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There is a fair ly s trong

correlat ionbetween CO2

levels and atmospher ictemperatures.

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There is ev idence thathuman act iv i ty causesr is ing carbon diox idelevels.

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There is ev idence thatglobal warm ing causesmore extreme weather.

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There is ev idence thathumans cou ld p reventglobal warm ing.

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Theory A:Human activity causes global warmingBurning fossil fuels

releases greenhouse

gases into the atmosphere.

Extra greenhouse gases make

global temperatures rise.

This leads to climate change.

Global temperatures have gone up by

0.7C since 1700.

Most warming was between 1910 and 1940and after 1976.The 1990's was the warmest decade of the

last thousand years.

Before the industrial revolution, 0.028% of

the atmosphere was CO2. Now the level is

0.037%.The increase in CO2 is linked to human

activity.

The concentration of CO2 in our atmosphere

is higher now than it has been for 650,000

years.

Many scientists agree that

increasing amounts of

greenhouse gases have madeglobal temperatures go up.Scientists predict that increasing

global temperatures will make sea

levels rise.Scientists predict more intense

hurricanes.Carbon dioxide takes 100 years to

disperse. If we stop making carbon

dioxide now, the effects of what we

have already done will influence

our weatherfor years.

The evidence:


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Theory B:Global warming is naturalThe Earth has gone through many cool and warm periods.

The causes of these climate changes are complex.

Human activity is not

significant when you

consider all the factorsthat affect climate.

Global temperatures have gone up by 0.7C

since 1700. This is not significant. Global

temperatures actually decreased between 1940

and 1976.Satellites and balloons have measuredatmosphere temperature since 1979. This data

shows little warming up to 8 km above the Earths

surface.

Water vapour is the most important

greenhouse gas. It makes up 95% of all

greenhouse gases in the atmosphere. Water

particles in clouds reflect heat from the Sun.

The Great Global Warming Swindle says that

human activity makes 6.5 gigatonnes of CO2 each

year. Plants and other animals make 150

gigatonnes each year. Dying leaves make even

more CO2. The oceans are the biggest source of

CO2.

CO2 levels in the atmosphere increase

or decrease because of temperature

change. When the climate cools,

oceans absorb CO2. When the climate

warms, oceans release CO2.Solar activity influences global warming

and cooling more than any activity on

Earth. Solar activity is now very high.

This may have caused recent record

temperatures.Current global warming is nothing

unusual. Temperatures were evenmore extreme in the Medieval Warm

Period.It is difficult to link weather events like

hurricanes to global warming. The

climate of the world is always

changing.

The evidence:

740-upd8 global warming swindle presentation

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