740-Upd8 Global Warming Swindle Presentation
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Transcript of 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: